if you are referring to the xtra long stand off in the middle of the case, compared to the rest?
That one is for making life a little more easy, when installing the board..
But you can swap that one, for a stand off with inner- thread, if you want..
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The board..
Yes, its about squeezing it right.. No brute force..
Check the backplate, it can get miss aligned, and if so.. the board dont fit so good..
make sure it is installed properly backplate = I/O plate..