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@adroit
I have done it it on a shimano XT rear mech by drilling a tiny hole, and then covering it with a drop of silicone mastic after pumping it full of grease. Peel off the mastic occasionally and pump more grease in, (the old grease comes out, and continues for a while) then recover with more silicone.
I have done the same to the jockey wheel bearing covers, and the pedal spindles.
Works fine, the mech has been in constant use since about 1995.