Making my own leather seals and resealing the BSA Improved D
I recently purchased a 98 year old BSA  Inproved
Mdl D.  And although it was shooting 14.3 CPLHP at 500 FPS, those in the know said it should be doing 600 FPS with the lighter RWS Hobby’s.

Close inspection of the seals revealed the seal was shreaded.

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This photo shows the new seal and the shreaded seal.
I read up on how to make leather seals on the American Vintage Airgun Forum, and being a former leather maker, I felt confident I could reproduce the cup seals of yesterday, after all it wasn’t like you could go down to the hardware store and buy them.
The BSA Improved Mdl D is simple to work on, requiring only a screwdriver to reduce it to it’s basic parts.

I started by buying a shoulder section of a bull hide, and then cutting it into 2 inch squares.  I then drilled 1.125 inch holes 1/2 inch deep into a fir 2×4.  I soaked the leather in alcohol for 24 hours and then set the leather squares over the holes and pressed a socket into the leather forcing it into the holes with my bench vice.  Once dried, I cut the leather flush with the 2×4 and then removed the dried leather cup from the board.

I soaked the seal for 24 hours in Neets Foot Oil,  I then fit the seal to the piston and filed it to shape and dimension.  I had preordered a lube kit from airriflewarehouse and once getting the seal filed to the correct dimensions, I lubed it in neets foot oil and moly and forced it into the BSA.

The new seal next to the old one, and by the way it now shoots the 14.3 CPLHP’s at 545 FPS so I am sure with the Hobby’s it will be close to the 600 FPS mark.

I love doing this stuff, getting these old rilfes shooting again is so rewarding.
Roachcreek
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Crow,
If your trying to form the leather, you should use either water or rubbing alcohol.
Oil is there forever and will not shape the leather to form it.
Water of course dries slowly, and you have to protect carbon steel from rust if your using your knife or gun as a form.
Rubbing alcohol dries much faster and you only have to oil your knife or gun afterwards. THe only danger is if you get cheap mexican leather that was tanned using urine, then things get really fucked up, but your nose will tell ou that you have the wrong leather.
Roachcreek