Hello all,
I recently received as part of a package deal an ExpII with an ETA 2836-2. However, the watch was not functional (known at the time) but I thought I would have a go at fixing it up. Opened her up and sure enough an ETA 2836-2 was to be found in the case fitted with an incablock shock protection. Very cool So the problem was that the watch wouldn't run and the crown with stem would just pull right out. Immediately this led me to believe the keyless works were messed and that the stem release was jammed. Sure enough this was true. However, the odd thing for me was finding this stem attached to the crown
Apparently this is known as the helicoidal sqaure stem. However, in my research it shows that this stem was used in the older 2836. Mine is clearly stamped with the -2 on it. Also, after digging into the keyless works I discovered that here also it appears that the workings are of the older variety.
Where this really got me was when the yoke spring went flying out of the case (marked in red in the picture) which now I must find a replacement.
So first of all my question out to you movement experts is...did the 2836-2 ever come fitted with parts like this or do I have a bastardized movement in my watch? Secondly do you believe it is possible to retrofit with newer parts to have keyless works like the newer movement with a standard stem? The only reason I ask this is that the helicoidal stem is a bit more finicky when inserting and removing. I have found through playing with this one that it needs to be in time setting position for removal/insertion or the works get thrown out again.
Thanks