I got these:
used them:
moved the potentiometer shaft around a lot and worked to impact as much grease as I could into the small crevice between the bushing and the shaft using various methods, not worrying about how much I wasted because I wanted to be sure some (enough) got in. wiped off the extra then applied a little more around the top of the bushing, bottom of the pot shaft.
end result is that it’s now more stiff feeling than my digitone, but I’ve only just done it and I think that’s to be expected. most of all my volume pot makes no noise, dead silence.
I’m still ordering replacement (potentiometer) parts as a precaution (because inexpensive), but seems that even if you spill, you can put the milk back in the glass after all (despite some people claims of ruin.)
all seems to be good to me, I’ll keep updated. Cost was about $20 since I bought both kinds, but I think the one I show in use ($14) would have been fine by itself, I just had no concrete evidence to know I could do this. But now it exists, the evidence you can easily fix the volume pot scratch even if you use contact cleaner on the pot and the original grease is gone, if that is the only issue causing it, this fader grease and some patience seems to be the answer. Only the long term will tell the full story though. The other one, small lube, would have worked similar but would not have had anywhere near the amount of resistance. might have been good for an encoder since they have such small gap between bushing and shaft but the analog volume pot I was able to work some into place and it doesn’t wobble about now either.
edit: @Eaves if you were curious as to the resolution, I think it’s ok to clean and regrease your pot if you’re careful but definitely need to open the machine (not too complicated). in the end, this has worked out well, I just wish I had known to order the grease before I cleaned the pot with the contact cleaner - but within a short time, it’s all resolved.