Radio Volume Control scratchy

[twoskies]

hello

have a 1972 chevy c10, factory am/fm radio
everything works fine
but the volume control when you turn its very scratchy sounding or no sound till you reach a certain volume, unfortunately its a little too loud when this happens

any radio guys out there can point me in right direction to fix, or just need to take out and spray volume control with tuner spray
i do have a few am only radios i could scrap parts from if need be

Thanks