Do you have access to a 3d printer? Can you do me a favour?
Three years ago, I published an Instructable for a paper catapult, which has had a steady trickle of interest ever since.
Recently, Instructables member hintss created files for it to be printed in 3d, but i don't have access to a 3d printer :-(
If you have access to a 3d printer, and the time/resources to spare, could you have a look at the files hintss has posted in the comments of the Instructable, and maybe even print one off??
Please? I'll even create a shiny new patch for you?