There always seems to be numerous older craftsman lathes, mostly with the single tube style frame, for sale in various places. They range anywhere from $75-$200, depending on how complete and additional items such as tools or tool rests. In a general sense, are these lathes any good, is there any inherent problems with them, such as bad bearings, misalignment, uncommon thread sizes on the headstock? If I just want something to mess around with without spending a lot of money on, are these worth it?