ok I came up with a simple way to do this w/o having to spend so much money.
Go to lowes and get a TOUCHDOWN universal pipe clamp (http://www.siouxchief.com/Frm_MS.cfm
In my case i grabed the one that goes from 3/8 to 1 3/8 inches. (is like 1,50 for a 5 units pack)
Buy a travel agent in your fav. LBS for 15 bucks maybe.
Take the pulley off the Travel agent, keep the washers, the center bolt and nut. The Clamp has two parts, the part that has the "legs" has a hole in the middle, drill the hole a little bit so the travel agent bolt fits tight trought it. Put the washers, put the pulley and the nut. Done!
Put some plastic tape in the frame where the clamp will be located. I have a tape that looks like rubber so the frame will be well protected, put the clamp very tight. Done!
I think u guys got the idea.