Ludger,

Any photos of your setup available? The plastic slider plate is a nice touch but not a stock item on the Infusion, sounds like a pain to add.

Of course I replaced my non-swiveling Harken airblock over the weekend with the same thing, I've used swiveling in the past but the manual shows a none-swiveling type. The way it's attached to the mast with the bale line I don't think a swiveling head would do much.