Okay, I just did some measuring on the T-C. It's the Pennsylvania Hunter with the octagonal to round barrel, 15/16" across the flats. The rear sight I used is the Tall Pennsylvania Sight from Track, which the catalog states is .425" tall from the top of the sighting surface. I was incorrect is saying I filed down the rear sight; it was the front which I did that to. The rear measured exactly .425" from the top of the barrel flat. The front sight shows where I took the top off a little, and it measured .358" above the barrel.
Track sells this sight in two widths, one for "up to 7/8 inch", #RS-FG-14-T, or "for up to 1 inch", #RS-FG-16-T. It seems to be the tallest primitive sight they have.
Windage was indeed adjusted by driving the front sight over a scrunchum. You could probably get a small amount of adjustment by rotating the rear sight left or right. If I did that it would have to be a very small movement or the sight would appear crooked on the barrel.
A person could make their own easily enough from a small piece of angle iron, drilled for the screw and then a slot cut in for the sight. It would certainly be cheaper than paying $8 + shipping! I may have to try that, just for grins.
~WH~