Impex MARCY DIAMOND MD-8870 Owner's Manual page 29

STEP 3 (See Diagram 3)
A.) Place the Backrest Board (#11) onto the Backrest Supports (#7). Secure it with four
M8 x 1 5/8" Allen Bolts (#32) and  5/8" Washers (#36).
B.) Place the Seat Pad (#10) onto the two Seat Brackets (#4). Secure it with four M8 x 1
1/8" Allen Bolts (#31) and  5/8" Washers (#36).
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DIAGRAM 3