So I finished up the design, it's a bit bigger than 1.5" if you include the housing :P but I'll give myself that one for making something that honestly is pretty darn awesome if I may say so! I haven't really had time to try to fix my drill charger or go get a new one, but eventually, i'll upload a video of this thing in action. In either case to make the video for this version I'm still going to have to wait for that GM23 motor to get to my house.

I did do some calculations to determine if this thing will work with the gear box. The drive gear from the motor is 10 teeth, and the drive gear for the pump is 43 teeth, that gives us a 4.3:1 gearing ratio. Under ideal conditions this motor can output 0.48Kgf/Cm which gives us an ideal torque on the pump drive gear of ~2Kgf/Cm. I can run the pump using just my fingers on the drive gear (albeit slowly), so I think that should be enough. If it isn't, the design is easy to upgrade to use the GM2, which outputs an insane 3.5Kgf/Cm giving us an ideal torque of 14Kgf/Cm! That will be overkill but I know it will work.

I uploaded all the files to Thingiverse as well, check it out and like my project on there :) http://www.thingiverse.com/thing:2012218. Also follow me on twitter! @Neoaikon :D