The lack of a drain plug forces you to do it right and clean all the gunk out of the inside. To refill, I used a funnel and piece of 5/16" clear tubing. Put the tubing on the end of the funnel, and then shove 8" or so of the tube into the rear. This allows the rear to breathe while you're filling it.
FWIW, the gear drives do have a drain plug.
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