Needing to make that much of a turn is a big red flag- - - - -the bolts are stretching way too much. The one that broke just might be the tip of the iceberg, or you could be way over the proper torque specification. I'd recommend replacing all the bolts, one at a time.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!