[TowerTalk] Crankup Tubular Tower Info

[Mike Newman]

Hi

I'm looking for info on the Wilson and other tubular crank-ups.

We don't get to see this make of mast here in ZL, but since I have some lengths of heavy wall steel pipe, I would like to build something like the Wilson crank-up.

Can someone tell me what the tower comprises, and how it is assembled?

Are the nesting tubular sections all circular or are some square in section?

How is rotation of one section within the other prevented - ie  is there a keyway or similar.

Thanks de MikeN,    ZL1BNB