Never hurts to measure two or three times and record/mark the position instead of finding out later it doesn’t have a pulley stop register. Actually get a can of computer cleaner or some sprayable Freon and put on a warm glove and invert the can and use it to freeze the shaft. It will cool to near -300 degree dry ice temps, too. Propane torch is best. Be careful and heat hot and fast, keep it moving. Shiny from heat is the point right before the surface starts to oxidize.