[TowerTalk] How to stiffen a mast

[Barkey, Patrick M.]

I've been using 24 foot, half inch wall, 2.5 inch OD aluminum masts
on all of my towers for quite a few years, with no failures or real
problems.  During the recent ice storm, however, a couple of them
flexed a little more than I'd like to see (they've since sprung back).
 
Now that I have the opportunity to think this over, I am wondering
if it would be of any value to try to add a little more stiffness to
the existing mast by driving something into the hollow center.
I've got a 1.5 inch ID hole to work with - perhaps some pipe or
solid rod could be driven into it?
 
Wondering if anyone has ever tried anything like this?
 
  - Pat
    N9RV
.