Hi. I'm trying to reassemble an old seiko 6119c which has a mainspring like http://www.clockmaker.com.au/diy_seiko_7s26/400_10.jpg
I was trying to insert it into the barrel by squeezing the split ends together and feeding the spring into the barrel CW, but the tail attached to the end deformed, This was my first time so I had to try multiple times, and tail lost it's shape and bent back with the rest of the spring even when not under tension. Is this just because it's an old spring? If it had been a new spring would it have kept it's shape?
Also, I've read a lot of contradictory stuff about how to lubricate the mainspring. The clockmaker.au site that I was going by recommends oiling the inside wall of the barrel, and there seems to be three different camps regarding how to lubricate the spring itself. Some say don't lubricate the spring, some say oil it, and some say grease it. I don't have mainspring specific grease, but judging by the gunk, I'd say the manufactured used something like graphite impregnated grease. I'd tend to the lead of the manufacturer.