I have come up with a design to fit my little Myford ML10 lathe and once built I will share it on here. I have drawn up the proposed design for the chuck. I think it will work. (Fingers crossed). I have tried to make it as quick as possible to load and unload and to achieve this I have incorporated a quick release mechanism on the chuck. This is mainly due to the amount of rivets I need to thread. Checked the boiler drawing today and it is 62 1/4" dia. x 1" copper rivets threaded 40 TPI so worth going down the lantern chuck route as I will also have it for future projects.
The home engineer