Which of the Williams .22 peep sights fit the Baikal double rifle? I saw about five different Williams peep sights. Also, for the front post, does the .072 seem to be the best, or should the one that is about half that width be used?

As to other work, I'm trying to find some computer files on work I did, or had done, to my Baikal. As soon as found (if?), I will post them here. The wood on my is not so much figured, but big differences in grain coloration. Welded metal on the triggers's tips, then reshaped. They were also bent back a bit giving extra room so that my knuckle would not be hit by the back of the trigger guard. Trigger springs were replaced. Sears were honed and polished to improve the trigger pull. I'm left-handed so I shoot the rear trigger first, then the forward trigger. Works for me. Any other lefty will have to try it themselves.
The opening of the action was a problem, but got that worked out for a full opening and extraction.