tobogon
Grumbler in Training
So no one told me untill now that if you cut a staple in half and put it in the back of a metal frame that you would close the gaps on the front of the frame! Why aren't people just talking about this all the time!? I still am!
If you don't know this trick, sit down.
If you notice gross gaps, cut a paper stapler's staple in half so you have a little corner. Loosen the screws on the back of the offending corner, hold the frame closed and place the staple piece under the inside lip of the channel. Then tighten the screws again and observe your glorious join!
If you don't know this trick, sit down.

If you notice gross gaps, cut a paper stapler's staple in half so you have a little corner. Loosen the screws on the back of the offending corner, hold the frame closed and place the staple piece under the inside lip of the channel. Then tighten the screws again and observe your glorious join!