Old "Ruby-style" .25 acp problems.

[Olle]

Originally Posted by OttoParabellum

Tried with 2mm washer and worked first 4 shots and then spring was too loose to keep slide into battery.
Recoilspring is stainless so its not original.

I have old ppsh41 recoil spring,would that be too tight? Diameter looks right.

Seems like your spring has had it, if it loosens up that quick it's probably a matter of metal fatigue.

When you pick a new spring, you need to look at:

Spring diameter
Wire diameter
Overall length
Number of coils

If you get all those numbers right, you will have a spring that's at least close to the original. Going by a replacement spring like yours will be sketchy at best, so you need to find one that's made to original specs. Wolff may be able to help you, if not I would suggest that you contact Lugerdoc or play the waiting game on Gunbroker and eBay.

The problem with the Ruby pistols is that they were made by many different manufacturers, and parts don't necessarily interchange between two seemingly identical pistols. However, I would think that the recoil spring would be one of the parts that's fairly universal.

With that said, I have been able to replace springs and make guns work by trial and error. You find a spring you believe is right and cut it a bit long, then you test fire, cut a coil, test fire again and so on until it works.