When Small Parts went away (or was sucked up by Amazon) we lost an inexpensive and readily available source for small brass bevel gears. I came across these that look like interesting alternatives in lightly loaded applications such as when driving distributors. Available in 18 and 36 teeth, 48DP; 1:1 and 2:1 ratios are easily accommodated in the same space typcally required for the brass gears. You can buy a dozen of each for less money than the cost of a single brass gear nowadays
. - Terry