Save or scrap?
Well I barely got started disassembling a Hampden 17 jewel movement when the head twisted right off of the transmission gear screw! So I guess my first question can the threaded shaft of the screw be removed, and the screw replaced? If yes, how and with what can it be removed? If no, do I just scrap the whole damn thing? Are parts worth saving for possible future projects?
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The alum that is generally available is hydrated potassium aluminium sulfate (KAl(SO4)2·12H2O), or potash alum, and it is one of those wonder compounds that has many uses including;
post shaving treatment for skin
deodorant
fire retardant
leather tanning
water purification
pickling
dissolving the broken steel threads out of brass watch plates/bridges
etc
Alum also refers to a family of compounds though, all useful stuff but the
