I recently custom-ordered a piece of plexiglass online for my Speedy 25. But when it arrived, I realized it was a bit too big. It could fit into my bag, but not without a struggle . So now I want to get it resized, but before I botch it up again, I just wanted to know what the dimensions should be. So ladies, for those of you who use the plexiglass for the Speedy 25, what size is yours that you can get in without a struggle and still make it stay without it shifting around?