The ST-350 wheel cups were designed to be used with the ST-350 press. First, the adapter marked with the red arrow is removed. Notice the two wheel cup bases marked by the blue arrow. The thicker base was seated in the bottom of the press, and the thinner base was fastened into the top. The green arrow shows the witness marks on the cups. The two cups were lined up using these so the drivers would be quartered. Notice the quartered positions of the cups by the studs marked by the yellow arrow. These studs fit into the threaded holes for the side rod screws.

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