It takes some experience wrenching on various things but eventually you know how tight to screw things into plastic before it cracks or strips and how tight to screw different size screws into metal before snapping off the head or stripping it etc. But since there is plastic involved I tighten it until it grabs snugly then go another 1/4 turn or so. You could technically crank it down hard enough to crack the plastic wheel. You want it just right