just reminded of something else. Small piece of cork tape on your dead magnetic bit works great too.If your trying to put a 1/4 or 5/16" hex screw back in and it keeps falling oout. And you don't have magnetic nut drives. A small piece of paper from your tablet will help edge the screw in your nut driver.
A fuse instead of a breaker for troubleshooting seems to defeat the whole purpose of the last post.A 3 or 5 amp GM blade fuse works real well. Use 1/4" stakons on your wire and slides onto the blade fuse real nice. Leave it there for the next guy if necessary. Saved my butt a few times.
Mini breakers are rare, a blown fuse is better than a blown transformer. Unfortunately some York units and others had no fuse on their circuit boards and the first short blows the transformer. Leaving a fuse inline prevents headaches and callouts at night and a hostile customer.