Do you have a vise and a file? Clamp the bolt head in the vise with the threads pointing up and take a few file strokes at a time off the end of the bolt until it's the right length. Time-consuming, but safe and accurate!
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!