lcastell -
In your middle picture,you show the short 1X1 square aluminum tube that is raised to latch the shell into place. If this tube were slightly longer, it would tend to close the gap. How about you lower the tube and push in on the wall a bit? Does it close the gap without causing any other problem? If so, remove the tube, turn it over a half turn, and re-drill the peg hole at a somewhat larger spacing.
You could accomplish the same thing by going to HD or Lowes, buying a short length of the same aluminum tube for a couple bucks, and cutting it and drilling it to the new dimensions. This would leave you with the original unmodified tube if you wanted to go back.
Don't overdo the change in dimension. You want the gap to be gently closed, just enough to seal, but not so tight that the slide drags badly if the you extend/retract it while the latch is engaged.
Bill
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