has anybody had trouble with the bolt that holds the ball swivel to tripod legs, i have been having trouble getting it to stay tight was acting up to night real sloppy was caring my rifle across my shoulder with tripod on my shoulder and all of a sudden rifle with thermal went crashing down to ground i was pissed found out bolt stripped out of the round part that holds everything together. cant see any way to get bolt or round piece out does anybody know if them parts or replacable or is the whole tripod trashed