[Dr G]

Pretty sure the "ultimate" in the FL Ultimate ligature means it's the ultimate mouthpiece scratcher.

I use them on HR and metal mouthpieces since they came out, and my mouthpieces are not scratched up. You must be encountering some operator error issues. The worst scratches that I’ve seen have come from people using the wrong size Rovner.

Regarding the OP: That scratch is too deep to buff out without removing too much material. The good news is that it doesn’t affect the critical regions that affect how it plays.

 

[Dr G]

Yeah, I have to wonder how far out of it you've got to be to take a Rovner ligature and stretch it so far over a MP it OBVIOUSLY doesn't fit, till the top screw's digging into the mouthpiece.

Dude! It doesn't freaking FIT!

Nothing is idiot-proof. Somebody will inevitably find a better idiot.