Will Junghans shock-spring tool work on a Trishock?

[MrRoundel]

Greetings all. I've got a ST 96 movement, aka Gruen 505-6, that I lost the lower balance hole-jewel on. The replacement jewel I bought was for an Incabloc setup and it seems to be of a different size, as the spring is exceedingly difficult to set in place. It also may be that the Trishock type spring is just extra difficult to deal with. Regardless, it would be nice to have the proper tool for setting that spring. Appearance-wise, the Junghans 3-arm springs look very similar, and I may be able to get that tool. Does anyone know if it should work on the Trishock in that Standard 96 movement? Many thanks in advance. Cheers.

 

 

 

[rogart63]

Is it the shock spring with a hole in the middle and three arms. Much like a Vostok spring.  I use a small toothpick in the middle so it doesn't fly away. I think you can use the Kif spring tool . 

[MrRoundel]

Thanks, Rogart. Yes, it's the type you described. The Besfit catalog, number 111A, Part 2, Page 720, describes the three-spoke types as being the hardest to identify. There are quite a few different types. 

I think you offered the toothpick suggestion before, but I forgot about it, as it's been a while. That would leave more room to get to the spoke with the other tool being used. I had been trying a whittled down piece of pegwood, but it seemed to be in the way. I'll try it out.

So you don't really try to push the spring arms down?  The spring just sits up too high on the cap jewel to allow the spokes to get in the slot. What are you thoughts on different jewel sizes for different shock setups? While a lot of the STD 96's used Incabloc, which would make getting a jewel easy, the Gruen uses this blasted Trishock type, which seems to take different jewels than the Inca. If I can't get those spokes in I'll just have to buy a parts movement for the lower hole-jewel. Oh well...that's modern watch work on vintage pieces. Thanks again. Cheers.