Standard mandrel is alleged to be "D" drill sized at 0.2460 - The PSI mandrels have tended to be a bit under that and Berea perhaps 0.001 over -
I use an 8mm "B" mandrel when ever possible because it has more cross section area (stiffer) and less subject to damage. (Think cigars, El Grande, etc) This is not going to work with that mandrel
If you already have a good live center (I am using one way with penmakers center) you can turn between centers without a mandrel or with mandrels -
Hey John -- This is a good opportunity for tooling junkies - I will pass on this one, but let us know how you like it.