Watch mainspring removal tool. 0:52 video:
https://www.youtube.com/watch?v=WKfUJ4jYMos
Previously:
https://www.homemadetools.net/forum/...929#post133702
https://www.homemadetools.net/forum/...269#post130848
https://www.homemadetools.net/forum/...948#post124957
https://www.homemadetools.net/forum/...459#post116947
https://www.homemadetools.net/forum/...203#post115922
https://www.homemadetools.net/forum/...321#post103950
https://www.homemadetools.net/forum/...4170#post79461
