Moving on to the eccentric nuts - This will be the most common type of tuning you perform on your printer. To begin adjustment of an eccentric nut, you take the 4mm hex key and place it in the hex head of the bolt running through the wheel and the eccentric nut. On the other end, you will place the 8mm open end box wrench and loosen the bolt slightly. It does not need to be very loose, and if it is too loose, that will impact your ability to adjust the eccentric nut effectively. Once the bolt is loosened slightly, you can then take the 10mm open end box wrench and spin he larger nut in between the wheel and the build plate. The nut is offset slightly so that as it spins it applies a different amount of pressure between the wheel and the plate. I recommend spinning the nut around completely at least once to get a feel for how the tension changes as it rotates around the bolt. Don't worry about "over tightening" the eccentric nut, as it doesn't actually tighten at all. It spins freely around the bolt with no threads running through the center. You can adjust the eccentric nut in either direction, so play around with it to get a feel for how it adjusts.