Looking for a small, well-made propeller for your projects? GWS makes a great series of propellers, and the EP2508 is a nice size for a pager motor!
Didel specially made nice aluminum brackets to fit the GM17 gear motor. Super light for very efficiently built robots!
Here's a really cool quadrature encoder and motor driver for the GM17 Gear motor designed by the micro-specialists at Didel.
Didel Module 0.3 Gears - 9 Teeth pinion, 0.61mm bore (4mm short pagers)
Didel Module 0.3 Gears - 12-tooth pinion, 0.97mm bore for 1mm shaft
Didel Module 0.3 Gears - 36/12-tooth spur, 0.69mm ID
Didel Module 0.3 Gears - 48/12-tooth spur, 0.76mm bore
Didel Module 0.3 Gears - 81/12-tooth spur, 0.78mm ID
Didel Module 0.3 Gears - Worm gear, 3mm dia, 8mm long
This package includes two sets of gears so that you can modify your GM17 to a 51:1 or 104:1 ratio.