Motors and Movement - Printing in Plastic: Build Your Own 3D Printer - page 226

Figure 13-16. Prepare the ZY Plate to hold the Y-Axis Motor Mount.
Place the belt pulley onto the Y-axis motor shaft and then add the motor mount, as shown in Figure
13-17. Tighten the belt pulley with an Allen wrench so that the pulley is directly in line with the bearings
(also seen in Figure 13-17) and tighten the nuts on the other two machine screws so that they are snug
against the ZY Plate and the motor mount.