I see where the weight of the armature bar is a big factor on the lining in a machine. The speed is a second factor, to make clean lines. I have another smaller faster motor I'm going to do for the Cutlass for a liner only. The Rapier II lines really well in the liner only with the stiff spring I have for it. I like the way to combine all my favorite machines together to come up with a Frakenstein Type Machine. I have a bunch of coil machine frames I'm going to create a Coil/Rapier type liner.