Blue painters tape be your friend to prevent paint in unwanted places.
Good source of metal gears is old windup clocks/can openers etc.. from the thrift stores.
Great project and thanks for the updates.
Thanks! It is actually pretty fun documenting the progress on this project and I am glad you are enjoying it. Is interesting to see what it used to look like and what it now looks like.
I will have to check out the thrift stores for an older can opener and see if that would work for my truck. Biggest problem I am running into is that I have to attach a gear to the axle and the wheels are only about 1" in diameter. Now I have to redesign part of the body of the engine to make it fit in my truck. Mostly it is just going to make the body a little bit wider just so I can bolt it down sideways and have a part that holds the axle.