Could do with some advice from all you clock specialists out there! I have strayed from the world of watch repair and briefly entered clock work! I have my Mums carriage clock which needed cleaning and regulating, nothing to onerous there (other than it's Mums!!). It's pretty ordinary unsigned carriage clock with a cylinder escapement.
Prior to stripping, I checked it over and ran it for a few days and noted it was running around 15 mins fast per 24 hours. I also noticed that the regulating index arm was cranked right over. Not a problem I though as a clean and reset may well resolve it, possible a couple of the hairspring coils were stuck together. So strip, clean, reassemble and lube and it's all back running. This time much sweeter with good amplitude of the balance. BUT, still running fast! I can get it to time but it requires the regulator to be pushed to it's limit. Now, when I had the balance off the cock, inspection showed there was some surface rust on the coils, could this effect the timing? Interestingly there was a fair bit of mild rusting on screw threads and the like. Very odd as it has always been in a warm room.
Anyway, I'm in a quandary, do I a) leave it as it is even though the position of the arm grates with me!! or B) pull the hairspring pin from the stud and lengthen the coils a bit, (there is some spare) and risk the spring snapping? I have tested the spare bit and it still seems to have a fair degree of spring left, or C) possibly replace the hairspring, although I favour that the most as I'm not sure where to go about getting the correct type...
So you see my quandary!
Any advice would be really appreciated. How much of an issue is light dusting of the hairspring coil going to cause? Will it make it more brittle? Should I be treating the coil with any kind of rust remover?
Thanks all in advance!