There is a gentleman who makes replica Rigby cocking piece sights, who can be reached at rusty42marlin@yahoo.com. He has had two Newton cocking piece sights of mine for some time now, using one as a model for reproducing the missing parts on the other. One, I believe, has a screw-in aperture. You might contact him on the off chance that he might be able to reproduce one for you.
I am not too impressed by the sights. They appear to be pretty wobbly. My Newtons generally came scoped: several with Redfield Sr. Mounts and Zeiss Zielklein scopes. My Model 1922 Newton is fitted with an early Lyman Alaskan scope.
Also, I believe Lyman 48 sights can be made to fit 1916 Newtons. At least one of mine is D&T for a receiver sight and the wood has been patched where one was removed.
