You are already using the best lube on the market. The bearings are not under much load, it's not a wheel bearing so you don't need to pack them with grease, a light complete coating is more than you need. You will need to clean and relube due to contamination before the lube fails. The bearings are part of a precision mechanism operating under lightly loaded very low speed. In fact you actually need almost no lubricant given the application so a light coating all around is plenty.?
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Chip Louie - Chief Daydreamer Imagination Hardware
Chip Louie