Mercury Marine Heavy Duty 899846001 - Manual (Page 30)

OPERATION
26
4. Slide the rear floorboard No."5" under the transom retainer.
a
b
24016
a - Rear floorboard b - Transom retainer
5. Fit the remaining floorboards together. Position boards No. "3"
and "4" so they are forming an inverted V shape. Align the side
edges of the floorboards so they are straight and then push
down on the V‑joint to flatten the floorboards.
a
24060
a - Push down
NOTE: The floorboards are strengthened with the side joiners
installed on the floorboards. Position these side joiners so they
will fit between the rubber stoppers located on the side air
chambers.