Hi Jim,
I thoroughly recommend upgrading the jewels on both the barrel bridge and the mainplate. I wouldn't bother with doing just the barrel bridge, the mainplate needs to be done as well. A note on movement holders: the 6139 jewel pops out of the plate very easily when trying to set the hands s oa movement holder is an absolute must.
Here is a mainplate and barrel bridge that I gave the jewle upgrade to.
View attachment 939765
Here is an example of what wear on the barrel looks like from sloppy holes in the plates.
View attachment 939766
If you need any questions answered about these Jim, let me know. I do a lot of them.
Ashton
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