https://www.instructables.com/Cardapult-Quicker-and-Easier-Method/
Cardapult, Quicker and Easier Method : 13 Steps (with Pictures) - Instructables
Cardapult, Quicker and Easier Method: A lot of people have been making my business card catapult as just a fun little toy to play with and don't really need it...
with picturesquickereasiermethodsteps