Picture of PVC Tiller Extension Swivel
A tiller extension swivel allows one to sit on the rail of one's sailboat, yet still steer. Tiller extensions are also referred to as 'hiking sticks'. A swivel can be purchased for minimal cost, but I like to build things, so...

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Step 1: Materials and Tools

Small piece of PVC pipe. I think I used 2 inch diameter, about 3 inches worth, leftover from a plumbing project.
QTY 2 #8x3/4 flat head wood screws
QTY 1 #8x1 flat head wood screw
QTY 1 3/16 x 3/4 "binding post" or pin with retaining ring
Spray glue
Pattern - attached later
Scraps of wood

Tools that I used, suggestions as to what one could use will follow in the steps where the tools were used:
Heat Gun
Drill press
Stationary disc sander
Sharp Knife
11/64 drill bit
3/16 drill bit
13/64 drill bit
Countersink for #8 flat head screws

Step 2: Flatten the PVC pipe

Cut a section of PVC pipe to rough length, about 3 inches. Split the pipe along its length into two half circles. I used my bandsaw for the cutting, a handsaw works just as well.

Heat one piece at a time until it becomes soft and rubbery. Do this outside, I'm guessing it releases some fumes that you don't really want to breath. I used a heat gun (think a hair dryer on steriods), one could heat in boiling water  or an oven. I'd avoid using an open flame, though placing it on a pan in a hot grill might work. Wikipedia says the melting point of PVC is between 100º and 260º C (212º-500ºF) I've tried the boiling water (100ºC) method and I don't think that is quite hot enough. Anyway, temp isn't important, soft and rubbery is. Experiment.

Once it is soft and rubbery, flatten out between two scraps of wood and clamp. High clamping pressure isn't really necessary, just enough to hold it flat. Allow it to cool. Repeat with the other half circle.