I have a fellow with an 1908 model 16s 23 jewel up/down indicator in need of a mainspring barrel arbor. Does anyone have a part number for this? Thanks.

Brian I am thinking what you are looking for is the lower part of the two piece arbor that has the gear on it...If that is the part the number is 4552...Just the little 10 tooth gear number is 4564...The number for the upper part of that two piece arbor is 4753...Gary

Gary, so the gear is a separate part of the lower piece? Thanks.
Brian C.

Brian usually you just replace that lower part of the arbor with the gear but yes that little gear will come off and is a separate part...I have separated them before but have never found that small gear for sale anywhere...

OK, thanks Gary.

I had a similar problem in Nov 2012 ---- there are quite a few posts on the subject. They`re a devil to find spares for. Look in May 2013.

Thank you Derek. Lot of info there.