Junghans J687 left-hand ratchet wheel screw

[matabog]

Hello!

I just want to give a head's up to anyone who's opening a jungahns J687 movement - the ratchet wheel screw is left-hand threaded. I found it the hard way - I had to replace the barrel arbour 
It didn't have the usual 3 line warning. Also I was used to the crown wheel screw being left-threaded.

 

[RyMoeller]

I have a Junghans on my to do list so it's nice to know they didn't use the usual Swiss warning (three lines on the screw head).  Thanks for the heads-up. 

[anilv]

Funny, I don't remember Junghans having a LH thread on the ratchet wheel! Must be getting old. I seem to remember the 'rocking' lever on the dial side to have an unmarked LH thread screw.... been a while since I've worked on one.

This is a shame as they used the more elegant two-screw method instead of LH thread on the crown wheel.

Anil

[matabog]

I'm not saying all the junghans calibers have LH screws on their ratchet wheel, but only that I found one that does.

[rogart63]

I have seen some old AS movement with left hand screws in the barrel. 

[jdm]

Moving to "Chat about anything", since it's not a walk-through.

[matabog]

thank you!