I sell wheel disks with alum straps for ataching around the spokes with either pop rivits or small bolt and nylock. We have raced without a staging disk of 10 years , but then again I built some 18" wire spoke wheels with 2.00x18 MC road race tires with a Akront rim that has a bit of a lip on the rim, so we never redlighted UNTIL we raced Phoenix for the 1'st time . Turns out they set their staging beams a little higher, enough so the JF cars with litle disks didn't redlite, but all the cars without staging disks did redlite, so since then we run a black light disk.
Good luck
Jon