Ring Expansion Mandrel for the Lathe (WIP)

(Very Wip)
This is a ring mandrel that should work with any lathe that has a 1MT. It has sizes from 18mm to 12mm and you will need a 5 x 35 mm bolt with a matching nut. PRINT / USE THIS ON A LATHE AT YOUR OWN RISK!
(4/7/18):
Reduced length of clamp, increased hole size to fit the nut/ bolt