Thanks guys. I thought the mounting screws for the valve are 8-32. The ones I removed fit on to a 8-33 nut, but they are pretty corroded. The 8-32 x1/2 screws I bought seem to bind and I don’t want to strip the threaded brass valve. Could be 8-36, but I haven’t been able to find them locally...seems to be uncommon, or I’m just not looking in the right place.