Looking at the various build logs, there seems to be a good amount of deviation from the plans with respect to the nutplates used to secure the access plate and the screws. NAS 1473-A08 nutplates are encapsulated version of the K1000-08 nut plate. There are use to mitigate the risk if leaks prom the tank attachment points. I've checked Vans Airforce and my buddy Mike, and all seem to agree that they are expensive but really good. I think i'll put and order in to Wicks and have it delivered to Vegas while I am there in the next while.
For securing the access plate, sounds like the standard AN515-8R8 screws are too short for these and longer ones are needed. Some say go with a screw head other than phillips as they are easier to remove and less prone to strip. I also read that cadmium plating is recommended for bolts/screws instead of stainless steel. Not sure if this is in fact true or not, but i am looking at using NAS1801 hex head screws as an alternative.
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