Removing Diana Original Cog Wheel Holders

[Mobiasstrip]

Knibbs still stock full set of springs and seals which is remarkable given age of pistol.
Some pics here.
https://imgur.com/a/7ggqume
Steve

[Mobiasstrip]

Model 10 getting the same treatment. Front and rear piston seals both were intact but cracked into pieces when removed. Cog wheel holders undid by hand!!!

Steve

[Mobiasstrip]

To complete the thread - some pics of Mod 10 reassembly.
The trigger is more difficult to put back together than the cogs and pistons in my opinion! Great piece of German engineering:-)
https://imgur.com/a/TXbTwvf

[abellringer]

I've lost count of the amount of chewed up pistols I've had for repair [rifles too]. These look a good option; however coming across so many problem ones; I've made up a jig which allows me to drill the cap with 2 holes same as on other Originals and then I use my 2 peg wrenches. Not something everybody might do, but I had access to toolroom equipment which gave me the chance to make lots of specialist tools. That said I'm still getting a pair of these and thanks for the heads up.

[Benelli B76]

Model 10 getting the same treatment. Front and rear piston seals both were intact but cracked into pieces when removed. Cog wheel holders undid by hand!!!

Steve

Are you also using a compression piston seal on the rear balance piston ?

Baz

[Mobiasstrip]

Are you also using a compression piston seal on the rear balance piston ?

Baz

Good spot Baz, the photo I posted shows two compression seals that I had already. Was awaiting the rear from Knibbs I think. Different colour for some reason. Here are the internals prior to assembly. Steve

[Benelli B76]

Thats better, the correct buffer seal which does not compress air in the rear chamber.

Baz

[abellringer]

Yes, I stopped using the "correct" seal when I realised they let the actual piston body run on the cylinder wall; as an engineer metal on metal isn't good.
The actual seal type makes no difference to compression because the rear piston has a hole in it, so vents to atmosphere, the rear piston doesn't run metal to metal, which I prefer. Have to say stunning photos though.