OK, all-wise and powerful members of this here forum. I was told it always helps to pre-lubricate before you start turning the nuts. LOL Here is my problem, I removed the brake pin and cotter pin, but now I have the linkage for the speed control. See the picture. I thought removing the nut from the side closest to the frame would be easy, and slide it out. I first tried gently prying the coupler off the ball connector but didn’t know if that was supposed to come off, I figured the nut would be safer. LOL, however, it would bypass the trans tubes. Is the coupler supposed to pry off the ball? Also, when I got the drive shaft it came with a new pin, and these yellow caps...what are the yellow caps for?