Glenn - Joe, The location behind the trigger of the ocular lense is 1 1/4" on my sidelever. That long base sure gives you plenty of adjustment of the ring location. You could even chop it into pieces once you have the locations perfectly figued.
I have an original High Wall here with a modern scope, but it is completely stripped for stock finishing and I'll have to wait till it's back together before measuring it.
It looks like the distance between the hammer and the scope is more of a potential problem with the Low Wall as shown, which mimics my issue with my High Wall project. (Can't do much shaping on an original Win. hammer for various reasons.) Something I hadn't considered seriously enough until late in the game.
So I would causion anyone converting an archaic action to a modern scope, be aware of a very low scope mounting even if the rifle doesn't have a hammer.
