The boat trailer bunk glides play an important role. Normally, boats get pitting, due to the reaction of salt water on the wood leaching through their carpet. This corrodes even the aluminum. You should insulate the boat from the carpet, by installing the trailer bunk glides. The glides can be mounted over the existing bunk, and are fixed with stainless steel screws provided with them. The glides are available in strips made of marine grade polymers, in required width and thickness, up to nine feet in length. The bunk glide strips can be drilled, countersunk and directly applied over the worn out carpet.
Step 1: Cutting the Length of Glides
Measure the length of the bunk glides to be fixed. Cut 2 pieces to match the measured length from the polymer strips. Often the 4 bunk trailers have 4 bunk glides. 2 of them are the longer ones, fixed at the bottom, while the 2 shorter ones are fixed on the upper sides.
Step 2: Drilling the Holes for Bolts
Place a new bunk glide strip on the supports of trailer and clamp it there. Mark the positions. Drill 1/4-inch holes for fixing the bolts. Drill another hole adjoining the previously drilled hole to form a longer opening, like a slot, at the entry of every bolt, lengthwise on the board. These slots allow the board to move when it bends.
Step 3: Counter Sinking for Nuts
With a 1/4-inch drill and countersink head, make space for the nuts on the top of the slots, for the bolts in the bunk glides, flush with the top face of the board. Countersinking will prevent the nuts from ripping the carpet, or damaging the bottom side of the boat. Make countersunk slots over each slot.
Step 4: Fixing the Glides
Fix the glides with counter sunk stainless steel bolts and nuts. The nuts should sit in the counter sunk slots. Tighten the bolts with wrench and sockets.