The end cap was slightly bent. Reshaped to achieve a snug fit on the grease gun seal. I wasn't sure if the reshaping was enough to get a good seal, but it seems to be doing fine as the tool doesn't squirt the lube out the sides.
ACDelco GM Original Equipment 10-9243 Dexron VI Full Synthetic Auto Transmission Fluid - 1 qt: Top-Quality Performance for Your Vehicle
12 Review
Idemitsu CVT Type N (NS-2) Transmission Fluid for Nissan - 5 Quart
16 Review
Liqui Moly 2001 Valve Clean
15 Review
Gaming chair COUGAR Armor ONE, upholstery: imitation leather, color: black
34 Review