LM8UU Y-Axis Adjustable Endstop Spacer

I wanted to use Toolson's endstop holder (https://www.thingiverse.com/thing:1054680), but the linear bearing wouldn't actuate the endstop before the belt bottomed out against the y-axis motor. This little sleeve fits over the 8mm smooth rod and slides onto the LM8UU bearing securely. A 10mm M3 bolt serves to adjust the endstop distance.