if this is in the wrong forum, please feel free to move it to the appropriate one. thanks
what i did was take part of a match and slide through an opening in the center near the axle as described in the pic. make sure the match goes over the axle, not under it. so far it works very well. the match is stiff enough to hold the axle so the gears touch, yet not rough to the point where the axle won't spin at all. heres a pic