Planetary Gear for 24v motor

I´m planing to make a mini drill for plastic parts, but the motor seems to not have enough power to drill, so i´ve designed this geared box to lower the speed and power up the drill, and it works great, a litlle bit noisy but strong enough!

You will need 2 608 bearings, a small piece of 8mm shaft, and 3 small pieces of 3mm shaft, i got those from an old cd reader, everithing fit in by pressure, but i added some superglue in the main shaft, and in the smaller ones, i hope its useful for some