Ditto...I use those as well...Along with the fillister head they are also available in stainless (if you like that sort of thing)....Ian

email (option): ian@wright52.plus.com

When I was building my primary case, I brazed new nuts on all round. The bottom half I then filled with extra braze around the holes and dressed back & /tapped through to increase the mating surface, no leaks so far, 300 miles into bedding her in.

email (option): LarkesrAAATTTgmail.com