Replace the lead screw in the knee of my bridgeport?

I have a BP EZ Trak that I built a power knee drive for about ten years ago. When trying to determine the required torque, I made an adapter so I could use my torque wrench to drive the knee. I placed two hundred pounds of lead on the table and then took the torque reading to determine what I could use for a motor. Here's a few photos of what I built.
Ted

View attachment 507985View attachment 507986
what is the friction material you are using?
 
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