Thanks for this. I'm not usually one to do modifications to get things to work. Sometimes a fix ends up being just the opposite. I may give this a try.
It's easy stuff. Just be gentle with the sanding - don't use a power sander. I'd just put a piece of sandpaper on a piece of glass (a dab of water on the backside will help it to not slide around as much) & just give it a light sanding by hand with minimal pressure. The other trick, if you have some smaller needlenose pliers (a multitool would probably work), grasp both the positive & negative posts with the handle at 90 degrees instead of pointing them straight down. You'll keep the blocks inline while being able to get some good torque on the post. If the insulator is a hard translucent white plastic (the real ones are, don't know anything about the knock-offs) you'd have to be the Hulk to overtighten the post by hand. They're not squishy like a lot of the clearo head insulators, so it's nearly impossible to create a short by overtightening.