This is actually doing my head in now as i just gave away a singer something 120rw121 with a roller foot that was for sewing pvc piping i am now kicking myself as i had no use for it bought it by mistake it was quite cheap but i dont think it would do the thickness i need but i never tested it i need this 45k89 really as want to sew some jackets out of felted wool blankets the 121 was fast had a motor this 45k is hand crank it will take ages to sew i wish id kept it now