Walther LP 3 Air Pistol Adjustable piston and O ring conversion.
This is for the LP 3 single stroke pnumatic as you cannot get the parts anymore.
This modified so you can adjust the piston to get the maximum stroke. Measure the overall length of the piston so you can adjust to that. that should then be at least as good as the standard, but if you can adjust it a few thou longer and it still cocks then power will be improved.
If you have any other seals that have gone then I can probably make them if you send me then as a pattern.