Ok I just got done shiming and checking this out.
The retainer has 4 legs and the little do-hicky that it sits on inside the slide has 4 notches on it. It will not allow you to put it in blocking the hole.
As long as you make sure you put the 4 legged retainer all the way in and to the bottom it is just fine.
Cheers! Off to the beer I go. Hi ohhh Hi ohhhhhhh YeaAHHH
