Harken 477 Small Boat underdeck furling - Manual (Page 6)

6 477, 493, 478 Small Boat Underdeck Furler
Carefully locate center point in deck to locate deck plate. Line from mast to underdeck chainplate must intersect this
center point. Mark center fore/aft and athwartships lines. Line up template accordingly. Mark four outer holes and center
pilot hole. Make sure closer pair of holes is forward. Mark center hole for drilling large hole.
Assembly Deck Plate
Deadend line before
mounting
Tip: After pilot drill bit clears deck, drill final hole from bottom using pilot
hole to line up hole drilled from top. This will prevent glass from chipping.
Tip: Run line through fairlead and dead end line into spool before mounting
lower unit.
If using an interior chainplate, check hole position by drilling a pilot hole
and running a low stretch line from mast head to chainplate.
Make sure hole is just large enough so deck plate bears against deck. It
is better to make hole slightly smaller and file opening larger to fit. Use
template to mark large hole and bolt holes. Once you are certain hole is
located in line with chainplate and any required shimming is done, drill
hole 90° to deck.
Use screws, washers, and deck sealant to
fasten lower unit to deck (see chart at right).
Note: Make sure there is sufficient thread
engagement into deck plate.
Furler
Minimum thread
in deck plate
477, 493 1 /
4
" (6 mm)
478 3 /
8
" (10 mm)