Upper and Lower Control Arm Bushings Won't Take Grease

[saxart]

I put new MOOG upper and lower control arm bushings and shafts on my '70 C-10 about 2 years ago. Today while under the truck with a grease gun, I was reminded that a few of the grease fittings won't take grease and have never taken grease from the day they were installed. (I guess it slipped my mind until now)

Has anyone else had to deal with this issue? Of the 8 control arm grease fittings, only 3 of them will actually take grease. All of the fittings and the shafts look brand new as the truck is never driven in snow or rain, so this isn't an issue with a clogged grease fitting. Could the end cap nuts just be tightened too tight which is bottoming out the grease fitting?

Thanks in advance for the thoughts!