The depth of my Auto-disk is .452" A piece of plastic that thick and 2.3" wide will slip into an auto-disk in place of the disk. Once you drill a hole in it just the right size and cut a notch to accommodate the actuating arm you will be able to make your own auto-disk insert of any size you want. If you make two half-height inserts, leaving one stationary and the other sliding back and forth you have just made a micro-disk.
It is something I have been working on in my spare time.
I hope you can post a discussion about this with pics when you have that ready. Please.