I can categorically state for the record that the Dualco grease gun did not put enough grease into the bushings of my Flux & 5 Spot. I think that the injection method isn’t good enough due to the small spiral groove in the bushings ie too much resistance.
Turner state that you should never over grease the bushings to the point that grease comes out of the sides.
I assume that’s because your essentially mis-seating the o-rings which would allow for dirt ingress.
I say bollocks to that. I pump till it comes out of the sides then fully clean the grease away on the outsides so the o-rings sit right.
You’d be amazed how much watery dark grey grease comes out of them.