Looking for a twin-wheel volume control Walkman

Hi,
I own an Aiwa HS-J2 in virtually brand new condition, but, unfortunately, the left channel volume pot is damaged and doesn't work past level 2.
This unit has a volume control with twin wheels that can rotate independently.

I'm looking for any cheapest cassette players that have such volume control arrangement, to source a replacement volume pot from one.
If you know of any, please let me know here.

 

Did you try a Deoxit treatment on the pots?
In most cases, Deoxit will fix it.

 

I did. It didn't fix it.

 

I'm not sure about the dimensions of the pot, the following models have the same 2 wheel arrangement.

• Sony TCS-300
• National/Panasonic RX-1960
• Sanyo M-G50

Not really cheap stuff, but in my area the M-G50 is quite easy to find cheaply for parts.