Yeah, PM me your email and I'll send you Step file or solidworks file. I believe when I had one of the engineers create the CAD model he made the slots to small. Just double check the size before making it.
Better a dark cloud than a Darth Vader (His name here is Dark Vador !)
I believe that your "own changer" is really a brilliant idea, and a nice realization.
Maybe I'm just a little sad because I would never have this idea !!!!!