You need flux, nothing is broken there, you just burned all the flux out of the solder. What tools do you have on hand? A soldering iron? Solder? A solder wick? Flux?

Yeah, that would solve the biggest problem, which is how annoying it is to hold when you try to use just the drill and grinder.

Dosing Cup: https://a.co/d/8G2iOGB

I got the eibos cyclops, it works amazingly but it’s not cheap.