I use these for crimping. Kinda expensive but for me worth the price. The advantage is it also crimps the rubber washer for a waterproof seal. Crimps the washer and wire in one step.
https://www.waytekwire.com/item/440/Aptiv-12014254-Weather-Pack-Crimping-Tool-/
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Can you elaborate on this? How does it crimp the rubber seals? (you're referring to the yellow "bellows"-looking part, right?
how well do these do in the rain?