I should test my own figures first .. The use of minute rotation is a better choice. You can colour or fill the gears as long as you don't effect the size/scale, outer outline or centre.
Try scaling the gear sizes (in pixels) to correct ratio.
x0.2 :: 191.6 x 191.6 145.8 x 145.8
x0.1 :: 95.8 x 95.8 72.9 x 72.9
The rotation ratio should be 0.75 (with larger gear being slower). The smaller gear can be adjusted by a few degree to advance the cogs (1 cog width = 10 degrees, so try +/-5).