Technics SL1200 SL1210 Tone Arm Bearing Holder

I have designed this as have to replace the tone arm bearings on a SL1200, and don't have any way to hold the tube for the horizonal bearings in a vice.

I am going to use it with a 7mm end mill, to machine a hole to take a totally different bearing.

Included two small pockets, which if you pop the two screws in the tube, will stop the tube from spinning if you are going to use it will a drill press or milling machine.

I have made it ever so slightly undersize, so there is a paper width gap between the two halves when assembled, so it clamps on the tube when placed in a vice.