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It's a utility that I made while testing out Gamemaker. To adjust the discs, use either the arrow keys, or the mouse buttons & mouse wheel.

Here is a ZIP file of the web version; meant for (offline) use in an HTML5 capable browser: [<5mb]
https://www.dropbox.com/s/wc94z29lsxpia ... b.zip?dl=1
**Refresh the page if you resize your browser. (Page needs permissions for javascript and offline files.)
Here is a windows executable application version: [7mb]
https://www.dropbox.com/s/tfn5gaj7ikcsd ... l.exe?dl=1