4 Trebuchet User Guide 58670 V0313
8. Put each end of the brass tube through the holes in the side
pieces of the base. Be sure the hook is on the same end as
the trigger and the diagonal cuts are facing upward.
9. Push the last two exible tubing pieces onto the outside
ends of the brass tube to connect it to the sides. Be sure the
lever can swing freely.
Building the Sling
1. Locate the piece of nylon
and the remaining 24" of
string. Trim each corner
of the ripstop nylon at an
angle, and use a hobby
knife to punch a tiny hole
into each end.
2. Cut the string in half. Tie a
piece to each end of the
nylon strip through the holes. This will be the sling.
3. Take the free end of one string and tie it into a secure
loop.
4. The free end of the second string should be carefully
threaded through the hole created by the hook on the
square end of the lever arm. Tie this end into a knot so it
stays connected to the arm. Use a dab of glue to make
sure the knot doesn’t come loose.
Note: It is very important that the strings are the same
length. They should each be close to 8" so that the sling
isn’t lopsided.
Adding the Counterweight
1. Straighten the second large paper clip. Look at the area on the design template
labeled “Weight support,” and bend the clip into a narrow, upside down U-shape
with sharp corners. Be sure the loop of the U is narrow enough to t through the
center holes of the mass plates.
2. Place the mass plates on the weight support.
Steps 8-9
Step 1
Step 2
Step 4
Steps 1-2
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