Frank, just like Monty said glue and paper joint.
Hope this helps...
Back in the day, 12 inch lathes were standard. Bandsaw a 5 inch waste block (2 inch Fir, Spruce).
Screw block to a 4 inch face plate.
Take blank and make x to find center, draw several circles, 4, 4 1/2, 4 3/4 and 5 inches.
Bandsaw 12 inch blank.
Check lathe speed setting... Mount and true face and side of block. Cut out circle from brown bag. Remove faceplate/block and spread yellow glue on block.
Glue paper to block, then spread glue on paper and blank.
Messy, but don't want to "starve" this joint. Wipe up excess, put in press and barely wait for next shop class... (Glue needs 24 hr cure)
Check lathe speed setting, mount assembly and true blank... Voila'.
When done turning, very sharp bench chisel, tap around glue joint, just pops and peels off, little sanding and no one would know that your project ever had a sacrificial glue block...
Funny, how a lifetime later, still checking the speed setting...[:I]