Believe me these bolts were tight. They had been cranked on not more than 3 minutes before they sheared and the center prop nut was cranked and double nutted. When the BME backfire it sheared both 6-32 bolts, broke the spinner and threw the double nuts. The 5/16 prop nut and locknut had just been tighten using 8" wrenches. Loose hardware and prop compression are NOT the problem.

Joe