Model 7 motor dumped in Wideline Featherbed frame. Transforms handling and roadholding but not comfort, although very early frames broke around the headstock (shouldn’t be a problem, these days). Improved in the sixties with welded up subframe, better brakes and new alloy cylinder head. Engine gets a bit rattly and vibratory if tuned, when rods and big-ends die. Nice enough bike but the SS gets most of the attention.