[electroken]

In my experience, serrated lock washers on terminal block screws cause more harm than good. Most of these screws are plated brass and the serrations just tear them and the terminals up. A properly torqued terminal block screw will not loosen up over an FRC season.

And always use ring terminals. They are a pain to use sometimes, but a loose connection won't flop around and touch something you'd rather it didn't.