Ok...I'm building my own tower...kick ass, we just stole the exact designe from last years Mastercraft towers...bought the aluminum...and hmmm, only cost 300 dollars for it all, instead of 2000..but thats ok. We have only one problem left...how to we attach our rope...I can't find anything here (in spokane wa) that will work. All people have is eyelits! HELP!
I bought a 6" long piece of 2 1/2" o.d. aluminum round stock and took it to a local machine shop where they turned it on a lathe and concaved the base for easy welding to the tower pipe. Total cost was less than 50 bucks.
Do it where it looks right, dont use the trailer ball. Like above get some rounds stock, and have it turned on a lathe. A machine chop can do it quickly and you will like it better.