i just finished rebuilding my top end after i have taken it all part to find my chain tensioner was bad. fixed it all up got it running good just to bring it out for a weekend trip to have it brakedown on the end of 2nd day after bring it back home i pulled the tensioner and just as i thoought broken again.

what could cause this to brake like this?

this is my 2nd one in a month to go through so something has to be casuing it maybe something in my lower end but i am not sure