I have the ampli-torc removed from the tractor (MM U302 Super) and am trying to disassemble it to replace the plates, etc. How do you get it apart? The tech book talks as if they come off towards the front of the tractor but there is a spacer there with a lip that won't let the parts off that direction. Do I have to remove the spacer from the shaft OR do I have to remove the back gear from the shaft and take everything off that way? I don't want to start pounding on anything until I am certain which way it comes apart as I do not want to break anything. Thanks in advance for your help.