pROBLEMATIC STAIRCASE AND PUTTER WORK...
120+ year old house, crooked staircase, and needing trim. The right hand side of the staircase was horrible, due to the wall that originally enclosed it being removed. The wall was removed because of the right angle turn at the bottom and the narrow width it was impossible to get furniture of any size up the stairs.
The stair tread ends were notched, and the risers were grooved in some places, and not in others, risers set at more or less 90°, etc. Anyway, after several hours of puttering, and way too many trips from stairs to garage and back, it's done. Now have to fill in some of the gaps and holes, and paint (wife's job). Problem was, didn't want to alter the steps in any way, trying to keep as much original as possible.
Alexis de Tocqueville was a very smart man.