Reply to Rotary knob upgrade on X-Session pro?

I can't stand how cheap the rotary knobs feel on my X-Session Pro. Has anyone tried upgrading them with more substantial pieces? Perhaps an OEM knob from a Bozak/Urei/Rane? The resistance is fine, it's just the plasticyness that bothers me since I use them exclusively to mix instead of the faders. (Die, faders, die!)