Thanks for all the info Wizcrafts and Ferg. I have a Juki LU-1508N that I use for making bags, pouches and outdoor gear. I have used it to sew some thin leather and will continue to do so. I use 69, 92, and 138 thread in the 1508 but mostly size 92. As I get more into making leather items, I have a need for a larger machine. But sometimes sewing the thin stuff I need a cylinder machine. That's what prompted my question. For the occasional time I need a cylinder machine for sewing a peculiar type bag or something, I was hoping my new big leather machine, say CB4500, could be used with size 92 (or 138) thread.