Step 6: Drive Engine & Gyro System Assembly
A bamboo chopstick was tapered using a drum sander and cut to the desired length based on the gyro system illustrated in the blueprint. I highly recommend cutting the bamboo chopstick a little longer since it'll be easier to shorten it in the later stages when mounting the main turret. With the lengthened gyro system, you'll have the option to position the main turret facing up, down, left or right. The bamboo stick gyro system was then glued on top of the drive engine and set aside to dry.
Two (2) drive shafts were fabricated from scraps and mounted in the slots cut in the sides of the drive engine assembly. After these were allowed to dry, a drum sander was used to shape the end of the drive units parallel to the drive engine assembly. This increases the contact area where the drive shafts meets the leg assemblies.