I'm having trouble getting the carb on this 020AV right. It's a Walbro WA. The kit I have is for both the WA and WT series of carbs, kit # K10-WAT I believe. My question is on the small plate on the needle side of the carb. Does both a diaphragm and a gasket go under the plate? And if so, in what order? Also, how's the needle lever height set on these? Thanks.