Broken Volume Potentiometer on a Polk PSW 350 Subwoofer
I can be contaced at: 

My volume knob on my subwoofer broken and I would like to replace it with another one.  I was hoping to find an identical part, or at least one with identical dimensions.  This item (R31) is listed in the Polk factory parts list as "POT, 100KA,9mmx1".  That sounds like a 100K ohm potentiometer, though when I opened up the speaker, this appears to be a 250K ohm potentiometer.  Can anyone identify this part?  What does the "9mm" mean?  I found a company called "Tawain (Alpha), though their only 250K ohm pc-mounted audio potentiometers were 16mm.   This potentiometer is pc-mounted with three solder leads.