OK, had new ball joints installed on the truck. Uppers and lowers. Asked for greasable, but they only installed greasables on the uppers. There was a lot of screaming. After looking at the lower joints, I noticed a indentation where the grease fitting would go. Can I drill and tap these joints and install my own fittings. Would like to get as much life as possible from these. Please help if you have any ideas. Thanks guys!