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You will need

Short ruler
Elastic band (quite thick)
Bulldog clip-Small enough to fit on the end of your ruler


                                                               IFORGOT PICTURES SO I DREW THEM!

Step 1: I Dont Really Know What to Call It . the Final Step?

Put the bulldog clip on the end of the ruler then put the elastic band onto the bulldog clip. Then use pencils to fire.

That "short" 4 1/2 foot ruler is extremely long. Maybe 30 centimeters is what you were thinking
150cm that isnt short?

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