[TowerTalk] 2"OD tubing inside a Rohn 25AG2

[Roger (K8RI)]

This really doesn't sound like a long mast vs another tower section.
It sounds to me like using a mast in place of the tapered portion of the 
top section.

I use an accessory plate in the top section, even with the top cross 
braces and mount a thrust bearing on it. Then a second plate farther 
down to hold the rotator. This means the mast sticks up little more than 
it would using the taper section.

Put grease zerks  in place of the bolts at the top sleeve with a smooth 
fitting shaft running through.  Even for thrust bearings, I prefer to 
not have them support any weight so the sleeve  bearing is ideal.  I 
would however use steel over aluminum most any day.  This is not a place 
where saving weight over strength is important.

73

Roger (K8RI)