I tried doing that yesterday and it wouldn’t rotate for me. I had a solid connection with the wrench on it but it would just slide off. I don’t want to risk rounding it off, either. The issue seems to be that the zerk head is facing inward, like towards the slip joint itself, not away from it. If it would just rotate I would be perfect! It’s so frustrating because of how much room there is, if only it would rotate I could attach the coupler to the zerk and get it filled with grease. Does anyone else have any suggestions? I appreciate all the feedback so far, guys