So here I am with my new grease gun and lock-n-lube coupler, greasing all my zerks for the first time ever. I get to the final one, the front-most U-joint, and the coupler won’t fit into the recessed space to reach the zerk. WTF. I found a needle and tried sticking in the zerk but it popped out. Am I doing this wrong? Do I need to get a different tool for this one stupid zerk? I had the wheels on the ground and the AHC In high if it matters.