17-09-2019, 10:58 AM
Well aware from bitter experience of the risk I removed one screw. Assuming it a 35M with external screws seems to be 2BA as doesn't want to enter a 3/16 BSF die. Dunno where you would get but were used in electrical things. May be able to countersink a cheesehead using drill and file.
Dunno what you know but using a digital meter the very low resistance between adjacent sections should all be very similar. it is common for the solder to have been thrown off.Often work despite very cooked appearance. Comm worn very low is often a serious problem
With a vernier calliper, now very cheap, and magnifying glass can usually establish thread dia and no per inch to identify. Various books have tables of threads often progressive and mixed, and all on the net somewhere.
Dunno what you know but using a digital meter the very low resistance between adjacent sections should all be very similar. it is common for the solder to have been thrown off.Often work despite very cooked appearance. Comm worn very low is often a serious problem
With a vernier calliper, now very cheap, and magnifying glass can usually establish thread dia and no per inch to identify. Various books have tables of threads often progressive and mixed, and all on the net somewhere.