I'm working on the family musical cuckoo clock. I have disassembled, cleaned, oiled, and reassembled the music box, and am at a loss for what kind of lubrication was on the barrel bushing. After ultrasonic cleaning of the music box parts, when I was pegging out all the pivot holes using toothpicks, I found the adjustable barrel bushing - the bushing near the ratchet, which is held in place by a set screw - I found that bushing was cup-shaped, and was filled with some sort of thick, dry goo (see photos). I used clock oil on all the music box pivots (including this bushing) because that's all I had on hand. Now the music box seems to behave except that every once it a while it decides not to play even though its fan seems to be free to move. I suspect part of the problem is a lack of thick lubrication in that bushing. I assume that bushing requires some sort of grease rather than oil. Any tips/hints as to what grease to use? Thanks.