if its going to be that much trouble i might aswell just change the head complete with the other one i've got that i know is a good one,annoying though,it runs sweet but every now and then it rattles.i can see wear marks on one of them but nothing serious,decisions decisions,run it over summer with a rattle now and then then do it all over winter or take it off the road now .winter souds good to me.cheers.