dart disk/upper A arm bush question

Farm Tools 101.
I think I got the idea from a thread here. It ain't pretty but it works finner than the hair on a frogs back (Carol Shelby). My new disk kit came with new upper control arms containing made in Mexico rubber OEM type upper bushings. I replaced them with this rig to PST poly's. If you can get the proper tool it's well worth it but, up here in Canada the Swiss Arm Knife and beer cans were not up to the task...LOL