Small edit. You can remove the decorative central disk, and there is space (barely) to get a grease gun nozzle to the zerk. However, as you inject new grease through the zerk, the old grease is pushed out around the rim of the hub, and collects in the cylindrical hub cover. And the space around the disk is too small to let you get at it to clean it out as it collects. You don't really want to run down the road with that hub full of old grease - it will slop all over the wheel. Bottom line - the only way to get the grease out is to remove the wheel and push that cylindrical hub cover out the back.
Bill
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