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We'd need to see where the other end of the grey cable goes.
The bent back ground connection only makes sense if the pot was previously used in another circuit. One where the capacitor itself formed the link between the volume and tone pots. e.g. A Gibson-style four-pot control array.
Are you certain it doesn't make that sort of difference? It might not actually be that obvious, depending on the type of pickups. One difference would be that hum/buzz increases when the pot is fully down.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
The control doesn't seem to do anything, I have put it through a high gain amp and there no difference to the hum. The alpha pot is not original and is the tone control.
Come to think of it, what format is the selector switch? Gibson-style sprung leaf toggle, Fender-style lever type or one of those hateful Asian toggles with its innards inside a metal box?
Trying to put it back to stock and found the original diagram but cannot make out what rating it should be . Also the any ideas 8n the brand of the 500k pot, I thought it would be a cts pot but the only markings are on the side.
https://ibb.co/cTdHt9j
https://ibb.co/mCnrzWn
In order for the control to work properly, you need to desolder the third terminal from the pot chassis and carefully bend it back to its original position. Next, use a .022 or .047uF capacitor to link the straightened terminal and the pot chassis.
The final step is to correct whatever is amiss with the selector switch wiring. It will be necessary to see photographs of the switch in order to suggest how to fix it.
Its rated 0.022uf 400v.
https://ibb.co/TKjLWNw