Jes...
I think there must have been a change in how the Williams sights mount, because mine has a screw where you've drilled your new tube mount to keep tension to keep the sight from sliding out of the dovetail. So this won't work.
That said, I did discover that shooting with two hands tends to pull my shots about 10" low at 7 yards, but when I shoot with just my right hand, I can drill it in there just fine. Strange eh? I'm thinking the gun shoots low on point, and that I just zing em high with the right hand only. Hopefully a solution will eventually present itself.