So I'm up to my armpits swapping power trains in my BJ42. I was swapping on injector pump shut off arm for the other because I couldn't get the cable shut off off the arm. I'm having a miserable time getting it back on. There is a small brass spline on the rod and there appears to be a slot in the hole in the arm. The spline seems wider than the slot? Is it actually supposed to go in their or am I over complicating it? All this work and this little problem is the hold up.