I am changing the bushings on the rear of my 2014 Trail. Rather than trying to beat the old OEM bushings out of the knuckle on the machine I was just going to remove the axle and get the old OEM bushings out on the bench. Well, I pushed in and pulled out and the axle came apart. I have never removed or installed an axle before. What did I do wrong and now how do I fix it? The pictures are from the driverside rear.