Reworked all the code so you can change the offsets, gear ratios, sprocket and ratchet tooth count, thickness, and even the cover spool direction on the fly and everything scales.

I also moved the return spring up to the lever handle, and changed the connecting rod to be piano wire.

The whole thing is a lot sturdier, but I gained .5mm of thickness in the process and we are now at <tape width> + 4mm,.  Good thing is now, if you want, you could just turn that down as a variable.  :)

I've uploaded the updated source.

Time to print this thing again.