"Now you drop the motor into the frame, attach a couple of bolts and you're done, " Case says.

FORBES: Easy Designer

Designed to be lightweight and cheap to produce, the robotic bicep upgrade uses a (mostly) aluminum frame, battery-powered DC motor, cable drive system, racket braking and thumbstick controller for movement, with a BeagleBone board supervising the electronics that pull it all together.

ENGADGET: UPenn's TitanArm exoskeleton prototype makes light work of heavy lifting (video)

Among the problems discovered by inspectors were "four undercarriage frame cracks including at the drive axle, at the cross member for the motor mounts, and at the differential and over the right front steering axle, " according to a letter sent by Berwick to Federal Motor Carrier Safety Administration Administrator Anne Ferro.

WSJ: Mass. official: Buses pulled from road for safety