hi mate, be carefull with the inserts, our club got them in and 3 clocks have jammed using them, make sure you get the rubber all the way down, if not they catch on the jagged edge on the top part of the insert,and when you strike the clock the plunger wont come back up, happened with mine one week and i had to pull the plunger back up, then went on to clock another and the same thing happened as the rubber was jammed in lid and top of barrel