Razor Scream Machine Jr Owner's Manual page 8

Install both wheels on the Scream Machine by threading the axle bolts
into the rear cross-beam of the Scream Machine frame. Using a 6mm
Allen key, carefully tighten the axle while at the same time checking the
wheel to see if it spins freely or if there is side-to-side play. If the wheel
will not spin freely, loosen the axle about 1/4 to 1/2 turn and, using the
supplied wrench, adjust the lock nut in or out until the wheel spins. The
correct adjustment is where the wheel spins free but has the least
amount of end-play as possible.
Retighten by holding the axle from turning. Tightening the locknut
against the frame as shown in figure 5. Repeat as many time as is
necessary to obtain the proper adjustment.
Check www.razor.com for tech updates or video clips on this and
other procedures.
Figure 5. Installing and adjusting the rear wheels.
With both wheels installed, the Scream Machine is ready for the front
fork.
8