[asid61]

Redid the gearbox to use 24t pulley in place of 26t, so that a 3" wheel can be used and not interfere with the cims. A 3.25" wheel will not work. The speeds are the same as before.
Weight is 1.75lbs, because I extended the output shaft a little bit so that you can use a 10-32 screw like a roll pin to keep the second shaft in place. You can also use e-clips to constrain the secondary shaft if you like. There was also an error with the shifting shaft spacing which was fixed.
Reuploaded to the Google Drive folder at the top.