I acquired an old Karle Spin Shop Lathe. The live center in the tail stock is horribly stuck. Yes I am sure from seeing pictures of other such lathes on line, that the live center is on an MT2 taper. Because of the age and rarity of the lathe I do not want to damage it. I tried penetrating oil and also tried kerosene. I have even thought about latching on to the live center with a pipe wrench and twisting it loose I am told the live centers are usually stuck from dried grease and once washed out with solvent, can be re-lubed and working again. They are a little different from Wood and metal turning live centers because they often have large flat surfaces against the work. (It is a metal spinning lathe.)