a roller skate wheel , free from my local roller rink ; a used brake arm from my personnel stash of goodies and then fabbed up a new bracket. the brake arm was used originally for a brake that mounts on a post on the frame of a bike, it has the small round spring inside that you can mount in different holes for the type of tension that you needed for your brakes. when I fabbed the new bracket , I drilled a 5/16" hole in the bracket ; then drilled a series of 1/8" holes around the larger hole for different tension settings and located the spring to the hole which best suited my needs. On both points (roller/pivot) I used 5/16" bolts with nylon locking nuts then decorated with acorn nuts. the little system works really well to my application.(necessity is the mother of invention)
well thats about every thing in a nut shell , if you have more questions feel free to ask

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I'll keep rollin "FileStyle"
"I'am just a penny short of being a millionaire"