Get a Grip Eh! Works great on Bullet Mics as well. (I use it on mine.)
Peel n’ Stick “Grip Tape” – Size: (Approx: 10.5 sq. inches)
Colour: “Clear” or “Black” (for the Midnight Edition Wahs).
For the folks that find they would benefit from a bunch of extra grip, the Harp Wah comes with some some very aggressive grip tape which can be cut to personal preference.
If more is needed, this “additional” tape is what you’re looking for.