Construct the crane as shown in Figure 18-51, or use an existing crane. The set screw at the outer..

Construct the crane as shown in Figure 18-51, or use an
existing crane. The set screw at the outer end of the 2-inch pipe should only
be tightened enough to hold the 1½-inch pipe in position—hand tight is probably
enough, but no more than 1/8 turn with a wrench after hand-tightening, or else
the threads may strip. This is the telescoping boom found on many portable
cranes. Use sandbags on the base to prevent the crane from tipping over. The
farther you extend the boom, the more weight you will need on the base. Do not
attempt to lift more than 20 pounds with the classroom crane.

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Figure 18-51