Looking for the exact potato masher for the KUD meter

So I’m gonna build a KUD meter! I already managed to buy the micronta 3001 metal detector! I was really lucky to find that for cheap on ebay! But my question is, where am I gonna find the potato masher? I noticed the exact/closest one is hard to find.

A link would be very much appreciated because I need to buy it.

I think that the vintage potato masher that I used for mine was extremely close to the screen-used one:

https://www.gbfans.com/forum/viewtopic.php?t=38318

Where can I find a similar one?