Mounting a degree wheel

You dont mount a degree wheel, you just put one on to degree it as you have to move it anyway once you find TDC. Are you looking for a permanent solution? Drill and tap a crank bolt for a stud and just bolt it on when you need it. Leave it snug enough to move it if you have to. Youll have to use a 1 1/4 open end wrench to turn your crank though after its chucked up.