Volume rotary knob repair

Thanks in advanced does anyone know where i can get my volume rotary knob repaired at in chicago or surrounding burbs i order the part from MPCstuff.com but have no clue how it goes in does it need to be solder or does it just snap in

I'll do it if you throw me a few bucks. I'm in Pilsen (Ashland and 21st).

are you in chicago

yes.

doesnt it just pop right on?