MF somewher you asked how I did the idle screw nut. I drill a 3/16th hole through the center of the cap, the run a 6mm tap through it. Then I put the nut on a 6mm bolt and screw it into the cap, then JB Weld the nut in place being careful to not getting any on the thread. Seems to work ok. When I get the mower up and running and I set the idle, I put a bit of silicone on the thread of the bolt and screw it in till I get the idle I want. This holds the screw enough to prevent it from moving once set but still allows it to be altered if required