I've got a few pipe plug questions. First, my filtered air box top plate has to have a relief cut into it to clear the bowl drain area on my carb. The instructions say to replace the stock drain plug with an allen head type, I assume to keep the relief hole as small as possible. Is there a preferred material? Is stainless ok? When I screw the thing in, it still sticks out quite far, which I think defeats the purpose of using it in the first place. What's the fix for this? Second, what would be the preferred material for the pipe plugs that fill the primer holes in the heads?