My mast has one foot section of PVC conduit every 4 ft or so bonded to the
interior wall with exopy (or some type of goop.

At first I couldn't figure out how they were installed.. Then I noticed that
the mast is in 2 section with a doubler and welded at about 25 ft up the
mast. Perhaps they used a method like Glenn discribes or a PVC pole to push
the conduit sections into position.

BTW, I have seen some mast extrusion that have a 'dove tail' grove (kind of
a internal track) on the inside that would allow a series of clips to be
used to secure the conduit in place.

--
My opinion and experience. FWIW

Steve
s/v Good Intentions

Steve wrote:

BTW, I have seen some mast extrusion that have a 'dove tail' grove (kind of
a internal track) on the inside that would allow a series of clips to be
used to secure the conduit in place.

That is a feature of Sparcraft/Charleston Spar. Actually 3 little tee
shapes on the inside. One on either side in front and one on the luff
track. You slit a piece of PVC conduit on a table saw, slip the kerf
around a tee and push it in. Pretty neat.

--
Glenn Ashmore

I'm building a 45' cutter in strip/composite. Watch my progress (or lack
there of) at: http://www.rutuonline.com
Shameless Commercial Division: http://www.spade-anchor-us.com