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Quick , Cheap & Easy Mast Crutch

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Go to Home Depot or Lowes and get a set of "gate" hangars. They come with 2 "L-shaped" lag screws that screw into the gate post and 2 "strap hinges that bolt to the gate and slip over the lag screws. Discard the gate straps (or save for another needy project).

Materials:

1 set "gate hangars" to fit your rudder gudgeons.
1 piece 2" x 4" x 7 ft. long
2 pieces 1" x 4"  8" long for spacers
2 pieces 1" x 4"  12" long for crutch side pieces
20 2" deck or drywall screws
1 tube construction cement
 
Before starting insure  the wood spacers are thick enough to produce a "crutch" wide enough  for your mast to fit in. If not, use thicker wood or additional thin (plywood) spacers to make the crutch wider.

Begin  by assembling the "crutch" at one end of the 2" x 4".

Use construction adhesive and 5 screws to attach each of the 8" long spacers to the sides of one end of the 2" x 4".
 
Use 5 screws and construction adhesive to attach the 12" long side pieces on the top of the 8" long 1" x 4"s .  Make sure you "miss" the screws holding the spacers.

 Drill a pilot hole approximately 1/2 the diameter of the gate hanger lag screws 4" from the other end of the 2" x 4"

 Measure the distance between the tops of  the rudder gudgeons on your transom  and drill another pilot hole this distance above the first (center to center).

Screw the gate  hangers into the 2" x 4".  Paint the mast crutch it you wish and you are finished!.

None of the materials used are critical so feel free to substitute what you have available.