[David Dunlop]

Brilliant find, Ben!

I must admit I am a bit surprised at the level of engineering for the right side of the adapter. I was expecting a simple square post.

My eyes are not the best, but if you look at the photo in Post 207 closely, I think the right hand wing nut assembly can be seen, particularly the base of the screw assembly where it pivots. What I am not sure of is whether or not to the outside of this wing nut assembly there is a large round fixture. If there is, could this be the missing sleeve? This sleeve would have the square fixture built into it and perhaps some form of floating central core that threads onto the right side of the adapter. If I am reading the drawing correctly, it appears that the right side of the adapter is drilled at the very end, as if a cotter pin could be inserted to keep something captive. The sleeve?

At least we now have an idea of what the adapter looks like. One more thing to look for in the 'Odds and Sods' bin at the local surplus shop.

The other thing that pops to mind is whether or not any Boys Rifles have survived today that have their frames drilled for this adapter?

David