I have a Singer 306k that can be turned into a treadle. It used cams (mine came with 28 of them) It says you have to use a special needle for the machine but mine was retimed to use the reg 15x1 needles. It sews a beautiful stitch and we got it at a local thrift shop in a nice cabinet for $7.50. Such a bargain. Good luck on the hunt for one you can turn into a treadle.