How do I attach the seat frame to the upright?
To attach the Rear Seat Frame (16) to the Ab Upright (1), rest the slot in the Rear Seat Frame on the indicated post on the Upright, then attach them with a 5/16” x 2 3/4” Carriage Bolt and the Seat Knob.
From the official Weider 8630 manual, page 21
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