I recently purchased a 1962 Clausing 4913 lathe. Works fairly well but lead screw is not engaging/turning and selector knob was broken off quick change gear box when I got it. I am attempting to take off quick change gear box assembly to inspect gears, etc. I removed gear cover and lower outer gear. Do I have to remove quadrant assembly and slide to left end or can I just remove end gears and slide it off to the right? I have disconnected lead screw and I see by diagram that there is a dowel pin holding it on too. Will the pin slide thru or pull out from back to allow removal of gear box assembly? Don't want to break anything else but trying to avoid removing all gears on left end and quadrant assembly if possible? I have manual diagram.