I'm not sure if anybody has told you this already but I know a simple way to create gears (I made all of the 103 gears this year and I think they cam out pretty well). What you do is count the number of teeth on the gear (Number A). Measure the diameter of the gear (number d). Then you divide 360 over how many teeth you have. Make an arc with that degree. Then place a line down the center of the arc (so that the line goes far beyond the arc). Then you make a tooth from the center of the line but leaveing space on eath of the arc. You delete the extra lines and use a circular pattern inserting the number of teeth as your number of times repeating. It's a bit complicated but after you do it the first time it gets pretty easy (I've made about 6 or 7 different ones)
