My uncle that owns the shop where I keep my rod, that is how he made his living. He will tell stories of changing the plane warning lights on the towersfor the Prudential center in Boston, where the maintenance guys escort you to the roof and open the door just to say "you're on your own from here!" LOL.. He would climb onto the fiberglas tower there and with his weight and the wind blowing him around he could look down the side of the building and count the glass panels! He would also tell of doing the lights over some bridges that would always raise the hair on my neck! Or a water tower where the catwalks collapsed behind him after he had passed over and he had to lower himself to the ground with his safety ropes! I never went into the "family business" LOL...