The mini lathe takes a 100mm 3 bolt chuck type K11 but there is no suitable 4 jaw available, so I bought this 125mm K72 4 bolt chuck and made an adaptor to fit. A K11 160mm face plate has the register and bolt pattern to fit the lathe spindle, all it needs is the face turned to replicate the K72 register with 4 bolt holes. This took a couple of hours to achieve and the chuck was finally fitted. It ran true but is a lot heavier than the 100mm chucks, made worse bt the cast iron face plate, so the face plate was reduced in diameter to 125mm, which noticably reduced the inertia of the whole set up.
The chuck needed a strip, clean and greasing before use, one jaw was noticably tighter in its slot so all four were changed around until the best combination of fit was found. One is still a little tighter than the others but it will wear in with use. This is a nice chuck and the extra weight is quite useful to keep heavy cuts going smoothly. General advise is to use a 4 jaw chuck one size bigger than a 3 jaw and I think that is correct, it will enable holding of rectangular pieces with the jaws as far out as needed, as long as they clear the bed of course.
Mark 
