Also,

After you drilled the holes for the stabs in the stab tube, did you pull the stab and look at the tube. Mine was just slightly short and you had to be careful that both holes actually had some "meat" around them. If you pushed it all the way in to one side and then drilled the holes one would be about 1/4" in and the other would be right at the edge of the tube or even worse, just slightly out of the tube. It may not be an issue for you on yours, but something to check anyway.

Arch