Review on Prime Line 9075389 Insert Stainless 10 Pack by Aaron Collins

I recently tried using these when repairing/replacing lawn mower deck spindles. Each spindle required four bolts and nuts. I thought I would be smarter and use these lock nuts instead of lock washers and/or threadlocker. What I received was three cross-threaded bolts HALF BOLT DOWN! I ended up having to grind nuts/bolts to loosen them - NOT GOOD. Why this happened I don't know. On some they worked as expected, at other not. :(