Step 10: Belt drive
Some M4 threads need to be cut in this step. See pictures as they should be self explanetory. What the pictures do not show is the fitment of some M6 thread inserts and screws in the lower base panel, which can be used for tensioning the belt. When fitting the belt, make sure they are the right lenght to allow for adequate tension. You have to judge this for yourself, just be careful not to overtighten the belts as this would stretch them. Try to 'twang' them like a guitar string and make sure they are all similar in tension by comparing the sound.