N/A Broken transfer port and how to fix it

[nobody1]

My .177 Nova Liberty transfer port adjuster blew up.

When I shot I heard a loud pop and the transfer port ejected the receiver.
I never expected to have projectiles coming sideways

The same transfer port is used in Nova Liberty/Freedom, Seneca Aspen and maybe a few more.

Anybody knows how I can get a replacement transfer port ?

I really like this air gun, and it is very accurate.
That's the main reason I don't transform it into a pile of parts.

 

[markhooper]

do you have the rest of it? I think it has a retainer screw on the other side, but likely that ejected with the other half.. also it has a detention ball spring loaded to hold it in position.. and do you use it on high and low?
guess I am asking because I am wondering what I might be getting into answering this post.. I have a American tactical liberty nova 22 and I used to use high and low.. but mostly use high now.. I'm really too busy right now but I could make it from stock, especially if it is the same as mine, because I hand fit all my machine work..
I'm really hoping that someone else answers and you can find a place to get parts.. that's the easiest way.. I really like mine because most of the newer guns don't have any open sights.. so if you do find out where to get parts,id appreciate to know where myself..
if you can't find anything, ahead and reply either here or PM me and it's going to be awhile yet because I just got in the middle of a project that's a bit more than I am up to and already doubled the first day..
but yes I can make the transfer port..
Mark

 

[markhooper]

also if you can be sure your gun and mine are identical, well except for caliber, that means I can use mine for the pattern and fit it and then it should just fit in a small bubble envelope.
Mark

 

[SilentSquirrel]

Air Venturi may still have parts for the Seneca Aspen in stock.

 

[markhooper]

Air Venturi may still have parts for the Seneca Aspen in stock.

so is pyramid air and air Venturi the same company? just wondering how to go about contacting air Venturi..
I guess it's a big disadvantage to me when companies sell things and they are discontinued and parts dry up..I like to be able to fix things.
Mark

 

[nobody1]

Air Venturi may still have parts for the Seneca Aspen in stock.

They do not have the transfer port and they have very few Seneca Aspen parts left.

 

[nobody1]

do you have the rest of it? I think it has a retainer screw on the other side, but likely that ejected with the other half.. also it has a detention ball spring loaded to hold it in position.. and do you use it on high and low?
guess I am asking because I am wondering what I might be getting into answering this post.. I have a American tactical liberty nova 22 and I used to use high and low.. but mostly use high now.. I'm really too busy right now but I could make it from stock, especially if it is the same as mine, because I hand fit all my machine work..
I'm really hoping that someone else answers and you can find a place to get parts.. that's the easiest way.. I really like mine because most of the newer guns don't have any open sights.. so if you do find out where to get parts,id appreciate to know where myself..
if you can't find anything, ahead and reply either here or PM me and it's going to be awhile yet because I just got in the middle of a project that's a bit more than I am up to and already doubled the first day..
but yes I can make the transfer port..
Mark

I have the small spring. I will have to look for the rest.

Thanks for the offer to make one.
I will try to find parts or make one myself out of thermoplastic.

 

[DesertSilver]

I have one. I replaced mine with one from Duy. He's not making parts anymore. Did you drill your stock one like AVS aka Stephen did when they first came out?

 

[markhooper]

I honestly don't think thermoplastics will hold.. but it's worth a try.. my first thought was that brass would be easy to work but I'm thinking too much of it is drilled out with the transfer port.. so probably tool steel..I'm curious, so I am going to get mine out and see if it is steel or aluminum.. because a lot of parts are aluminum for lightweight.
let me know what you find out and if you will need one made..I really hope you can locate parts but I'll make one if you can't.
Mark

 

[markhooper]

I honestly don't think thermoplastics will hold.. but it's worth a try.. my first thought was that brass would be easy to work but I'm thinking too much of it is drilled out with the transfer port.. so probably tool steel..I'm curious, so I am going to get mine out and see if it is steel or aluminum.. because a lot of parts are aluminum for lightweight.
let me know what you find out and if you will need one made..I really hope you can locate parts but I'll make one if you can't.
Mark

oh just got to thinking..I wonder if the avenger x has the same transfer port?

 

[DesertSilver]

I honestly don't think thermoplastics will hold.. but it's worth a try.. my first thought was that brass would be easy to work but I'm thinking too much of it is drilled out with the transfer port.. so probably tool steel..I'm curious, so I am going to get mine out and see if it is steel or aluminum.. because a lot of parts are aluminum for lightweight.
let me know what you find out and if you will need one made..I really hope you can locate parts but I'll make one if you can't.
Mark

The original is plastic. If you want to drill it bigger it needs to be strong steel.

 

[markhooper]

The original is plastic. If you want to drill it bigger it needs to be strong steel.

I'm surprised that plastic will hold.. but if someone needs one..or several I can make it.. it is faster to make a batch per piece than a single one..I do have high strength steel shafting in my shop and brass.. guess if plastic is holding for a little while, brass should be good..I enjoy machining brass..
you all let me know if you need anything..
Mark

 

[nobody1]

I found the other part of the transfer port lodged in the door next to me.
I was lucky to not be in the way when the transfer port broke and the 2 pieces were ejected to the left and to the right at high speed.

I have managed to make a working replacement for the broken transfer port part.

The receiver hole which hosted the broken transfer port part is 24mm long and 7mm diameter.

I have used the following parts:
-M4 bolt and screw
-M4 washers
-3D printed TPU o'rings/cylinders (OD 7.4mm, ID 3.7mm, 8mm long)

The TPU cylinders need to be screwed onto the M4 bolt.
The TPU cylinders fit very tightly inside the receiver hole where the transfer port used to be.

With the new transfer port the rifle has become much more quiet.
I assume that before air was escaping through the transfer port (which had 2 o'rings).

The velocity is the same as it used to be on High.

Next, I will cut the bolt shorter.

 

[nobody1]

Who says that transfer ports need to have round holes?

 

[nobody1]

80 shots later and everything works perfectly.

The original transfer port part was not modified in any way.
I doubt you could drill it safely.

For those who were thinking of drilling the original transfer port larger you should try my solution above.

 

[nobody1]

The original is plastic. If you want to drill it bigger it needs to be strong steel.

In my Nova Liberty the transfer port is made of non-magnetic metal.
I assume it is machined aluminum.
If it were steel it would still be in one piece.

 

[DesertSilver]

You're right. It's been so long since I replaced mine with a steel one I forgot.

 

[nobody1]

Shot again 80 shots through the Nova Liberty with the new transfer port.
Works perfectly.

 

[KatoKevin454]

And another High Five for Backyard Engineering........ Great job and thinking on the fly for nobody1....

 

[nobody1]

And another High Five for Backyard Engineering........ Great job and thinking on the fly for nobody1....

I am actually an engineer by trade.

I have a 3D printer and I am not afraid to use it !