This photo shows the pieces. The main pulley with set screw and key in slot, a 3/4" external snap ring, the adjustable side of the pulley, 1 15/16" OD x 2" expanded length compression spring, 67# load rating and top cap.

A wood block is held in an arbor press to put pressure on the assembly so the snap ring can be attached safely. Also, notice the snap ring pliers.

Assembled pulley. Finished size is 3 1/2" diameter by 3" long.

Speeds from 200 to 700 from this 1720 rpm motor on an 8" A  pulley.

Thanks for looking

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