Steering couple not reaching

It can't go any further than the firewall so his issue is he needs to pull the shaft out at least 1/2 an inch
You guessed it.... tight to the firewall .... have pulled the column out and taken it apart again...took shaft out and tapped it down 3/4 inch ....two pins are there and put some weld bond in other 2. There is a notch on top of the coupler and it slides down over first part of spline. I did notice the steering box has a wider grove at the 9 o'clock spot. Does that notch have to line up with the notch on the coupler that's at 12 o'clock. It does slide now over first spline but not second set.