Guys, with almost clocklike predictability, my trimside metro 48 spindlebolt will just crossthread itself approximately every 150 hours as its being unbolted. i hand tighten the nuts till they are snug then torque them to 75 ft lbs. have you guys ever heard anything about this happening elsewhere? im getting tired of loosing it for a day + and spending ~$70 to get it rectified. Any ideas?