A lot of teams trigger their device with a string or rod that is pulled. Keep in mind that the triggering device (3.e.) must allow for you to be at least 75 cm away from the launch area. So you'd most likely need a string or something that is long.Also, will I be allowed to pull a string to release the hook and activate the trebuchet?
I'll consider your previous question later today; I have something coming up in a couple of minutes.