KarKaddy SS Assembly

I am wondering if anyone has assembled a KarKaddy SS. I got delivered on Thursday and am in the process of assembling it. I have hit a snag. I cannot get the male and female coupler(s) together. The instructions say to us a 9/16 open wrench on the back of the male to help hold it and slide the female coupler forward until it snaps in place. I can only get it together so far, brake fluid starts to drip out. Any tip or advice would be appreciated. Or is it that I am just not that strong anymore to force them together? The frame is 10 inches off the ground as per the instruction manual.

Thank you