Mounting Rear Barrel Sight

[bigskybound]

I purchased an aftermarket rear sight for my Model 8. It is unmarked, but is similar to a Lyman No. 25 base with folding leaf. The barrel sleeve has two holes that have inserts that seem to be unthreaded and wiggle around in the holes. The sight came with screws, but I am at a loss as to how to mount it.

[imfuncity]

Under the holes there is suppose to be a plate with threaded holes that act as the nuts for your screws. Seems, that there was a bit of a flange on the plate above the holes that helped align the plate and start the screws. At least that's the way I remember it and I'm sticking to it.