The video instructions are pretty bad, from an assembly perspective. Build the Z-axis plate complete first, including alloy spacers, Z-axis anti-backlash nut and screw and wheels all installed, but without the top and bottom plates or moving extrusion. When assembling the X-axis, START with the lower wheels - the ones with the eccentrics. Push the four screws through the plate and put the plate down on the bench, then it's just a matter of dropping the components in the right order onto the screws, unlike the ham-fisted, two-thumbed aberration that is the assembly video. Drop the eccentric or spacer, washer, wheel, washer, spacer, two washers, wheel and eccentric onto each respective screw, then put the front plate, complete with installed z-axis screw, wheels, etc. onto the screws and nip up with the nuts. Then you can stand the assembly on its side and tighten up to the stage at which you want to adjust the eccentrics. No faffing around balancing holding the plate, juggling the screws and trying to jam everything in between the plates like was shown in the video. Should be a piece of piss.