I have a class 26 as well. Pretty much what @bladegrinder said, I go real slow when I get close to the corner and pay attention to that last stitch. When I get to about where I think the last stitch will be I stop using the foot pedal completely and turn the wheel by hand till my needle almost touches the leather, then I can raise the foot and manually move the leather so that last stitch lands exactly where I want it to. Then I can turn the wheel to sink the needle and turn the piece, lower the foot again and keep right on sewing.
I'll add that I didn't have to remove a brake pad or anything on my class 26 to be able to turn the wheel easily.
Good luck!