Theoben Testing a seal adaptor for SLR 88 and the likes.

A.G.R

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Jul 27, 2022
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Ok ,got your attention now. MENTION SLR , eyes raise up..

So those who know ,know that ..
1. Theoben seals are like a fine women. … great when they are working ,but extremely hard to find
2. They tend to be soft and burn easily ( Probably from over psi for extra cowboy ft lbs)
3. One man has them and has a monoply on them and will not sell them UNLESS you send the gun to him .. oh yeah. THEY ARE let’s say $$$$ 🤬

4. AAAND , finely a poor design in my opinion. A soft cast seal that depends on a shoulder button inserted into the piston itself. I’m SORRY THEOBEN GUYS.. THERE ARE BETTER DESIGNS. Simple HW HEAD THAT TAKES A UNIVERSAL SEAL. 😉. ITS ,OK, Air Arms dropped the ball to,on their Pro Elite to. ( I’m firing lasers today 😆)
5. The Zepher or however it’s spelled. (Got to watch out for Karl now ) , DOES NOTHING for power . Nothing a standard cup seal wouldn’t do. Flame💥 …. I hear it now,, ” it’s for heat transfer”. …… “ it channels the magic air” ….. “it gives softer recoil”…..

If you believe that ,”I have some ocean front property in Arizona ”. GS . I’ll sell ya. 😆

SO , I’m testing a design I saw on a UK form that uses a 27.5 mm seal. ( fits the SLR AS IM SURE OTHERS WELL, EXCLUDING ELIMINATORS)
It’s a delrin plug with a tapped center with 4 legs that spread and grap the interior ledge on the piston.

This is a 12 ft lb gun, with light weight cocking and short stroke. Heats not a big issue . ( unless the power cowboys get their hands on a pump)
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I am sure a O-Ring design would work well to. I’m not saying that if you have a factory gun this is a better Idea. It’s a work around without modifying anything on the gun,so as you can go back to 100% original if you want or find a factory seal.

For the record, If I owned this gun ,I would be shooting it weekly. I don’t watch them collect dust.. A TOOL unused is USELESS.

Am I planning on making them for sale. Nope. It was a work around until or ,IF ,THE OWNER WANTS TO GO BACK.

Just for you Theoben fans. I will do a post on the re build when complete. I’m doing full stock refinish and re- blue.

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You can spell it any way you want. Your word salad makes sense today. Less 🍺 ? 😁
See the caps lock button on the left side of the keyboard? (y):giggle:
Remember the Zephyr 77? That was another good one.:rolleyes:
And Theoben carved the Zephyr symbol into the end of the breech plug on O ring Eliminators, etc. WHITCHCRAFT!
That seal might fit Fenman or Evolutions. Might be they're answer. That's cool. CNC the adapters.
TBH I'm not really an SLR fan. I'm sure you'll make it about as good as it can be.
Sirocco is the only one I really cared for. Pretty cool for what was out there in the 80's.
 
You can spell it any way you want. Your word salad makes sense today. Less 🍺 ? 😁
See the caps lock button on the left side of the keyboard? (y):giggle:
Remember the Zephyr 77? That was another good one.:rolleyes:
And Theoben carved the Zephyr symbol into the end of the breech plug on O ring Eliminators, etc. WHITCHCRAFT!
That seal might fit Fenman or Evolutions. Might be they're answer. That's cool. CNC the adapters.
TBH I'm not really an SLR fan. I'm sure you'll make it about as good as it can be.
Sirocco is the only one I really cared for. Pretty cool for what was out there in the 80's.
karl, Im a life salad 🤣

I don’t know about all the Theoben , I do know Metal rings were tried as well as o rings.
I won’t comment on the SLR. OTHER THAN IM NOT A UNDERLEVER guy. That being said, it’s a hell of a lot of fun not loading until you run 6 or is it 7 through it .. look for red. … 😯


Yes , a flat head screw goes in and expands as pressure is applied.

Brilliant.
I would like 6 please.
I’m ignoring your comment about not making any to sell….
😎
Your back, I see you haven’t been around, living the island 🏝 life.
 
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Just thinking..........
If you use a starter tap and don't run it through, the thread will be tapered and could expand the plug in the piston where it binds the screw and keeps the plug held tight in the piston. We don't want that screw working loose!
Delrin is slippery. Makes good bushings, you know
Pretty close.

Tapered fuller bit drill and as, you stated, tap only 3/4 of the way ,, as the bolt passes through it creates its last .062 of self taping expanding the wings

😉