The hex locks are made to fit securely on the hex shafts to prevent the hex shaft from sliding out of position in the nacelle or the simpleGEN housing. As a result it may be difficult to slide the hex lock onto the shaft in the first place. We recommend placing the hex lock onto a flat, horizontal surface such as a table and pushing the shaft vertically into the hexagonal hole. Slide the hex lock back and forth along the shaft a few times, which will loosen it a bit and make it easier to slide it on the next time. After placing the hex shaft into the nacelle or simpleGEN housing, a hex lock loosened in this way will slide on more easily than an unused hex lock.

Hex locks and hex shafts are included in these products:
Drivetrain Set (KW-DS)
KidWind Advanced Wind Experiment Kit (KW-AWX)
KidWind Advanced Wind Experiment Kit (KW-AWXC)
Advanced Wind Experiment Kit Nacelle (KW-AWXN)
KidWind Basic Wind Experiment Kit (KW-BWX)
KidWind Basic Wind Experiment Kit (KW-BWXC)
KidWind simpleGEN (KW-SGEN)