It is
HERE on page 4.
It is basically an impossible gear to mate with easily. 60 DP, 25 Degree Pressure Angle, enlarged. I don't know where to buy a 60 DP gear, yet alone a 25 PA version of one. I suppose you could find a close gear and (plug your ears) and let the gears "run in" but where's the fun in that.
I have already shared my thoughts on how to put this 7 Watt Wonder to good use.
Look here.
More FREE ADVICE (and worth every penny ;-) from THE Dr. Joe, accept no substitutes...
Joe J.