Invacare top end pro 2 all sport Assembly Instructions Manual page 13

Step Seven – footrest
Use the two-part clamps and 4 bolts.
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 Assemble the clamps as seen in picture below.
Place the larger side of the clamps around the base frame down tube in the
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position desired.
Put the other side of the clamp around the footrest and tighten using allen key.
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