I'm building off of the pinion example build shown here: http://openbuilds.com/builds/v-slot-belt-pinion-example-build.97/ but with a 20x20 rail, and the mini v plate. The same exact set of components is shown being assmebled in the first build video shown here: http://openbuilds.com/builds/mini-v-linear-actuator-build.48/ So - its all gone together nicely so far. Things 'fit' well enough except for the carriage itself. It seems that the eccentric spacers don't actually adjust tight enough for the wheel to securely bite the rail. It gets close. But I need another .5mm before there is no "play" on the rail. Have I done something wrong? Has anyone else seen this with the mini-v plate before? I may be understanding something! Attached is a photo of what I built so far.. notice anything wrong?