I'm not a professional by any means, but I've been using my Waldom branded crimpers for quite some time, and it hasn't led me astray. I've successfully crimped entire games (mostly Gottlieb System 1s) with them with no troubles. I picked it up at Great Plains Electronics, model W-HT-1921.
https://www.greatplainselectronics.com/products.asp?cat=138
For the larger .156 connections you see on rectifier boards, you'll want to pick up the red handled crimper (although, I've used my crimper for the larger connectors with no troubles--you just have to be more careful. Probably not recommended to do, but it works in a pinch.)