Benjamin Question for those of you who have opened up the transfer port on your Marauder to .187"?

[smbob]

So I just ordered a JASAR Balanced Valve and lightweight Super Hammer.
My plan is to crank the power on my .25 Marauder up!
I know in order to do so I will have to open up the transfer port.
On Youtube, JASAR says they opened up the transfer port to .187"
Also Hill on their max power offering includes a .187 drill to open the transfer port.
Seems like a common theme.
I'm looking to get 50-55 ft lbs out of my .25 Marauder. (33.95gr Mk II heavies at 830-850 fps)
I'm not overly concerned about shot count.
My question is, To anyone who has done this, is there anything else I will have to buy extra to
do this, or can I open the transfer port, deburr everything, clean it, and let, and let 'er rip with the stock parts?
Thanks in advance!

 

[Motorhead]

A stock transfer tube WILL NOT go to .187" w/o ruining it. At that size you need to use A semi hard tubing cut a tad too long, and it gets compressed when tightening down receiver. Automotive / Truck air brake tube works really well for this. ( Cut square with a razor blade )
Barrel also needs to be opened up having it de-burred at bore when done.

 

[jking]

Trust what Motorhead is saying. I went down this same road probably 10-12 years ago and I bugged the heck out of Scott (Motorhead). It was a great learning experience though. That was back when the Marauders were the hot item to tweak on. BTW Scott, hope your recovery is on schedule.

 

[PumaCarl]

Since you're already buying from Hill, he sells the transfer tube that Motorhead is talking about making, if you aren't comfortable just making your own.