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It's not a good idea to drill into the housings.Metal particles will get inside no matter how careful you are.What I do is inject grease into the joint thru the boot area with a needle grease fitting.It connects to your grease gun like a grease fitting.Just pierce the boot and place the tip at the base of the joint and put in a few pumps until the grease comes out like normal.The needle tip is available at most hardware stores or automotive part stores.