I've got an older one, and despite the age, that fine-tune depth adjustor still is fluid smooth, yet holds it's position. There is an O-ring stuffed...
Found a couple-year old thread elsewhere that was quite discouraging, regarding repair of a domino machine by factory service, so wondering if fixing...
I'd be calling the cabinet factory and asking to purchase a quart. You can feign "touch up" as the reason, in case you feel they'll begrudge you for...