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With a 1/4-inch drill bit mounted in a portable electric drill, insert the bit through the crank wheel handle hole you just drilled and use it as a guide to drill a series of four half-deep holes at approximate 90-degree intervals in the rotation of each crank handle. During assembly, be sure to put the cranks on the right side for right-handers…or the left side for left-handers.
Drill the 1/8-inch diameter string holes in the crank axles (Q) (see figure 1). Sand the axles so they move freely where they pass through the cab mounting holes. Don’t sand the very ends of the axles where they go into the crank wheels. You’ll need a tight fit, here.
Assemble and mount the crank wheels (P) , crank handles (R) and crank axles (Q) with glue so each end of each axle is flush with the outer surface of a crank wheel. When assembled, there must be enough “play” to allow the assemblies to move side-to-side so the boom and hook positions can be locked and unlocked by engaging the protruding ends of the crank handles (R) in the holes you drilled in the cab side. Remember that the crank/axle with a single string hole goes in the top forward position on the cab.
IMPORTANT: When gluing crank handles (R) into crank wheels (P) , be sure the handles each protrude about 3/16-inch beyond the back side of their crank wheels. These protruding handle pins are engaged in the half-deep 1/4-inch holes you drilled in the cab side, acting as stops to hold the boom and hook in position during play. Continue . . . |
