I have an old Jet Lathe JWL-1236 knock-off made in China that I am modifying into a variable speed lathe using a 2-1/2HP DC motor. The spindle has an external thread of 1x8 at the head-stock on the opposite end of the spindle there is an internal thread that goes in about and 1-1/2". Does anyone know off hand what the thread pitch is for this internal thread? This would be where you place your knock out rod to push the spur drive out of the morse taper in the spindle. I looked in the parts manual for the Jet lathe and China knock-off and no thread pitch is listed. The DC motor has a threaded motor shaft that I am wanting to mount on the opposite end of the head stock and machine a threaded adapter that would thread into the internal spindle thread. The China made knock-off supplier is no longer providing certain spare parts for this machine so I am wanting to do away with the reeves drive pulleys and try out a simple install of a DC direct drive motor. Mike J.