Musician Forum - Band Discussion Board - BandMix

The compression wedges are hex wrench drive.
Most probably metric.
Actually, I use metric hex wrenches almost exclusively. Even on nuts based in fractions of an inch.
A better fit can be had with less chance of slippage.

Did that answer your question ???

No problemo.

Glad I could help.

"A Lost Lullaby" That was nice. I listened to it a couple of times.