In this months (Jan 2018) BHI mag there is a short article headed “new take on the spare parts problem” . “The British watch & clockmakers’ guild” have started a data base for the search for spare parts. You have to register to to upload your parts for sale but it is FREE for anyone just looking for that illusive missing or broken part. I have done a few test searches and some very, very familiar names of sellers are emerging!!!!.
Anyway their web site address is as follows
http://bwcmg.org