Updated: One person's circuit board was a bit tight on the bottom hole where the solder points stick out, so I enlarged the hole a little to account for variances. I also put a small fillet on the holes, so it matches the style of the part better.
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I added M3 threads to mars_null's Adjustable CR-10 Z endstop, so now you can use the original screws that mount the end stop switch to the adapter without having to tap the holes.
I also increased the height of the slide rail so that you can actually lower the Z end stop by about 3mm from stock. Before the remix, you could only raise the end stop.
Lowering the end stop allows you to move the extruder closer to the bed, compressing the springs a bit and stabilizing the bed a bit more.
I limited lowering the end stop to 3mm because if you lower it much more, the wheel/roller will hit the bracket before the gantry hits the end stop.