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

During my current Wheel Off Maintenance session, racing Mr. Waddington to the upcoming Nineteenth South'n SpineRaid, I gave this a go. I have tried EVERYTHING, over all this time, to grease "that bloody farking front UNI joint " as @dangerous so aptly referred to it. Many of you recall that I finally resolved to just pull my swingarm every third rear tire and triage the shaft . . . Like @Guzziglide, I approached the front Zerk from forward of the swingarm using the 180º swivel ti