It isn't absolutely necessary to use fluid in an autobalancer.? I've read some build logs that used bearing balls in a grooved disk.? Claimed to work pretty good.? The key to proper operation is to make sure the bearings can move freely in the groove.
Awhile back I bought a cheap HF grinder to make a dedicated tool grinder, based on a Harold Hall design.? I haven't made much progress on that but fully expect it will be necessary to add some kind of wheel balancing system to it.
