The best source I've had is the Wilson videos on customizing 1911's. Those, in tandem with the 2 Kuhnhausen books from Brownell's are a fantastic place to start. Yeah, it's a few more bucks, but you'll have resource info for all the 1911's basic operations available.
If you're fitting a new safety to a built from scratch gun this may not apply.
When fitting a thumb safety I have always found it's easiest to just look at the factory part you're replacing and carefully, slowly, taking only a little material off at a time, fit the new one till it basically matches the old one and functions properly in the gun.
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