Since 16" lathes seem to be the topic of the day, how practical is it to cut metric threads on one? I would like to cut metric threads (1 to 3" telescope optics) and I only have one lathe - my 1937 South Bend 16" single tumbler lathe. I talked to the South Bend people some years ago and the necessary gears were much more than $1000 and much more than my budget could afford. Is it feasible to make a set of gears to do this? Can it be done without changing the tumbler gears? If so which gears do I change and how hard is it/ how much time does it take to change the gears? There are only a few threads I need to do. Is it something one wants to do on a one-off basis or, in spite of having more time than money, am I better off getting a lathe that is set up for metric threading?