ALK8944 - thanks for response - They are 10/32 as I have tried available ones and they are correct thread. Undestand your doubting, but this is a 1935/6 Win 65 in .218 Bee with a T-5 ring/base (slightly countersunk) side mount combo for 3/4" scope - J-4 type. The plug screw is still available from Brownell. My gunsmith/machinist friend also verified all of this. He said he can make a couple, but +- $50.00
Individual Scope Screws, Etc. has the correct Weaver screw design but, as you note, the 10/32 is no longer offered. I have to believe that some (really) old timer may have a couple. Will use the flat base if I have to, but shooting for an "origonal" setup like I used on groundhogs about 1952-3.
Any ideas would be appreciated. T