2:1 reduction that can be placed any where on C-Beam

So, this is the idea; a 2:1 reduction that can be placed any where on the C-Beam, besides that, a bearing block can be used to free up the end of the C-beam so both ends of the C-Beam are free and easier to mount on other V-Slots/C-beams.

Some highlights:

- 2:1 Reduction or 1:2 speed-up
- Only one large eccentric spacer needed for adjustment (custom, not OpenBuilds part)
- Special plate on both sides when gear reduction is implemented, one plate is needed for 1:1 or 1:2 speed-up
- Can be...

2:1 reduction that can be placed any where on C-Beam