BOSS OC-2 - need a new Direct Level blend pot

So, in a hurry this evening after rehearsal, I accidentally kicked an Option Knob (OKnob) that was mounted on the Direct Level blend pot and snapped off the top part where the shaft is split. So bummed about this.

Is there a specific pot I need to replace it? Is this something I could replace myself or do I need to bring to a Boss Service center?

I really should get my OC-2 modded to add an Octave only switch