All pen turners have seen the "elliptical effect" from a mandrel used one to many times. I took a ride on the wide side and picked up a M2 center and some "Between-the-center" bushings from JohnnyCNC. I couldn't be happier. It took about an hour to get used to the set up and being habitually absent-minded, but this stuff makes all the difference
Amboyna burl and Spalted Maple. Both have CAx3 finish with Ren Wax for fun.
Lemme know what you think!!