I am looking for 10mm washers for volume and other potentiometers on an Marshall amplifier. Does anyone know of a website that sells these washers? I tried multiple websites and the hardware store but their washers are too thick. I need a washer that is very thin and preferbly brass or other metal.

 

Maybe try GRAINGER.

I would use their online catalog for a part number then use that number in an Amazon search, if you can't make an account.

 

https://www.tubesandmore.com/search/node/washers

 

I tried the link above and they do not sell 10mm washers. Do you know of another website that sells them?

 

I tried the link above and they do not sell 10mm washers. Do you know of another website that sells them?

3/8" = 9.525mm, slightly smaller than 10mm. Check and see if 3/8" will work for you.

 

I have no idea as to your location. Here in the US I would do as was suggested go to McMaster Carr or Grainger Supply both of which are industrial supply sources showing endless arrays of washers by OD, ID material and so on. I would first try Lowes and Home Depot home improvement suppliers.

Ron