I read lots of good comments on how to diagnose and replace the shear coupler on my 231S MF, and those have gotten me this far. PTO side cover removed, cotter pin removed, aft section of coupler removed...when it comes to sliding the forward piece of the coupler forward on the shaft, it appears that theres a burred edge along the shear line stopping it from sliding completely back enough for the shaft to be slid aft to disengage the transmission. My best guess is if the coupler piece would slide forward another 1/8 or so, the shaft would drop. Given the limited access to the area and not wanting to damage the shaft, Ive tried limited tapping on the sleeve but no movement....anyone encountered this issue before?