[morzh]

Received the potentiometers with taps for the volume from Oldradioparts, ordered two just in case - they are cheap. The exact replacements were made by Mallory and Central Lab.
NIB.
The terminals were oxidized as heck. Had to clean them.
The shafts are twice as long - obviously purposed for multiple radios. But they are made of aluminum (good idea for a replacement part) and so was easy to saw off - I do not even have a hacksaw, just the blade, so I held the blade in my hand and sawed it off in about 2-3 minutes, filed it a bit...done!

But guess what.
After the Deoxit on my origina pot dried up, it sucked the graphite inside the crack as it was drying (or it is my theory). Now the contact is restored and the rotation of the wiper does not break it.

But....my rule is, you do not break your agreements with God. If it took you to buy the new pots to fix it, keep the new ones in and relocate the old one to your local museum.