Push Arm

This is a basic push-arm GBC module, designed to show that GBC doesn't need exotic parts. You probably already have all the parts (or reasonable substitutes) in your collection already.

The main module uses the common power drive shaft popular in the Pacific Northwest (e.g. BrickCon), but the secondary build is a power-providing motor that slips under the input hopper for the module and can easily power up to 5 of these modules in a row.

Inspired by Kevin Mitcham's workshop module from Bricks Cascade 2018, this variant extends the input hopper to ensure that the push arm never intersects the incoming ball flow (less spillage), simplifies the gear train (higher reliability and fewer parts), and clarifies the building instructions to be suitable for my 7-year-old nephew (proven this last Christmas when I gifted it to him along with sufficient parts to build the module). It also provides a clear and clean way to integrate the power module instead of relying solely on an external power source.