This may not be the same display case, but the one that I had, I just stood in front of it, and tried to place the item (I think it was a helmet). It sat in side the case just fine for me. I would try that and taking it to Re-Tail. But having it customised may make it permanent. I was able to get my helmet out later and wear it again.
Wow! it's been over a year....
I've really missed you guys, it's good to be back