Soloflex butterfly attachment with 2 foam pads. Assembles over main rail. Requires SS attachment pin and threaded butterfly pin (or roman chair pin) (not included). Ships partially disassembled into 2 main parts to reduce shipping cost. Assembly points and hardware will be marked "A" and "B". Align 2 pcs, insert bushing hinge pin and tighten using 7/32" Allen Wrench. Heavy steel construction, built for long life.
