The C3.2 Lego Crossbow-Rocket Launcher

 by Bitterberry9

Step 9: RBs + Loading

the firing rubber bands, and the counterweight rbs. (4 counterweight rbs, total of 9 firing rubber bands- in 3 sets of 3 rbs tied together).

NOTE: To increase the firing power, you will need to lubricate the firing runway. Take some Vaseline or some similar product, and a q-tip, and get some vaseline on it. Spread the vaseline on the walls and bottom of the firing runway, and when finished, run the rocket down the runway multiple times, to get rid of excess (cause you only need a very small layer).
 
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