hi all,just thought i would give you an update.the roller that the hooked closing lever pulls down on was a sloppy fitting 6mm.working with the thought in mind that if i increased the diameter of this roller it might take up the slop in the closing mechanism,i machined up a couple of replacement rollers before i hit on the best size for my gun 7.1mm .this took up the wear in the links so the gun closes nice and tight with no slop and shoots with no loss of pressure from the breech .thanks to all for your input ,cheers greasemonkey..