What about if the O ring felt a lil lose or big should I buy another one or is their times that it comes a lil big? Will sanding it make the trick it just feels is to big and no need to stretch like every one mentioned?It would leak from the belt side because of the o ring. That oring should be a bitch to put on. I had to stretch mine to get it onto it's mount. Be sure to take some sandpaper to the oring groove, to make sure it's smooth to press in.