SX/SXi/SXi Pro 750sx gap in between pump and pump shoe

I'm new to the 750s and I was installing my pump last night and I noticed a small gap between the pump seal and the pump shoe. It's very small. I can see light through it. Is this normal?
 
I used epoxy to fill the back side of the pump shoe and then a little more to smooth out the transition between the shoe and the pump. might be overkill but whatever
 
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