Greasing the drive shaft

I know this has been beat to the death but I just broke a 180 flex coupler grease tip trying to grease the rear nipple. I tried grinding it down where it would fit into the u joint but I guess I went to far. Would I have better luck with the needle fitting for the rear joint? The spline nipple is sheared clean off and I cant seem to get the leftovers out. I'm wondering if it would be easier just to pull the rear wheel and take the drive shaft out. Thanks, Toby

I apologize if I've falsely raised hopes for short frame owners, this worked for me on that hidden grease nipple on my LONG frame bike. Imho, if there is any coupling that MAY work on short frames, this would be it. Take a look at the photo on this link below; that short 4" pipe to the left on the 180 degree swivel coupling with the spring over it, has male threads on both ends;remove it; you now have a 180 degree swivel with female threads. Remove the coupling from whatever type