Ender 3 Wide Y axis rail conversion

This is a modification to the Y axis rail of the Ender 3 to provide a much wider footprint for the rollers which gives far better stability and rigidity.
All the details are in the provided PDF. BEWARE! although this mod is completely reversible, a fair degree of tool skill is required for this to be effective. While it doesn't require any more than a few basic and a couple of specific tools, please ensure you fully understand what is required before waving a drill at your printer!