yea that's the thing. You use to be able to, take the clip off.
use a thin tube, inject grease, there. And then the new grease
pushed out the old grease, your hub, bearing, had new grease.
It made it easy to keep your hubs, greased. And I belive, the
racers, use to just inject some kind of heavyer oil, and use that
which cut down on the the drag of the grease. This was back in
the late 60,s early 70,s.