Spring U-bolts have enought "spring" to them that they will wind up & spring back with an impact, be air of electric. You can feel it when tightening them by hand.

Glad you caught it before things got real exciting!

BC
1960 Chevy C10 driver 261 T5 4.10 dana 44 power loc
1949 GMC 250 project in waiting
1960 C60 pasture art
Retired GM dealer tech. 1980 - 2022