[TowerTalk] Rohn HDBX Advice

[Kelley]

I just put up a Rohn 48' HDBX tower. Before I start putting up antennas, 
I want to add some more grounds to the tower. The current bolts that 
hold the tower to the base are not long enough to add another nut so I 
can attach the ground wire. I've been unable to find any longer bolts 
that will work as the unthreaded length of the longer bolts is to long, 
thus I hit the end of the thread before they are tight.

My multiple part question is, does anyone know of a supplier of longer 
9/16" bolts that are threaded their entire length? If not, does anyone 
know of some sort of clamp that would attach to the tower legs that I 
can attach ground wire to? Or, can one drill another hole in the legs to 
attach a ground wire without jeopardizing the integrity of the tower? Or ?

Thanks,

Kelley