2 holes and a hook...
Bob,
I don't know where I learned this, so I can't give credit where it is due. Here it is in my own version. certainly not as clear as if written by Brion, but clear enough to follow, I hope.
1.) Cut the conduit to length.
2.) Draw a straight line down the length of the conduit (this will help keep things straight as they go together)
3.) Draw a straight line down the length of the outside of the mast along the path the conduit will take.
4.) Exactly how to get started will depend on the exact individual situation, but hopefully you have access to either the top or the bottom of the mast so you can hold the conduit in place as you drill the first hole through the line on the mast and then through the line on the conduit.
5.) About 18 inches along the line on the mast, drill a hole ONLY IN THE MAST.
6.) Use a wire hook in the previous hole, align the conduit with the second hole so you can drill right into the line you marked on the conduit. Hitting the line is important, if things start twisting you will get in trouble is short order as the conduit tries to spiral inside the mast!
7.) Putting your hook in the second hole, align the FIRST holes in mast and conduit and secure with a pop rivet.
Repeat steps 5 through 7 until you reach the end of the mast.
Best results may be had using a brad point wood working bit to drill into the conduit; things tend to skate around less. In any event, be sure the drill bit used for this step is sharp; you can't push on it and keep things aligned.
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