Just finished up changing Bearings on my Porper Model B and it was much easier than I thought and I got great support from Don at Creative Inventions. I had a scoring on my spindle from the bad rear bearing and I reset the new bearing with red threadlock...anyway the good news... 1/2 thousands on my front chuck which is a Bison and I got one of the aftermarket sleeves and rear Taig chuck and its running at 1/4 thouisands. I was running 3 thousands b4 the bearing replacement so I am just about hit the floor when I put on the dial indicator after I got it back together. I am pumped and amped now.