Crossbows 4 and 5

Both no 4 and 5 function as elastic band guns and fire pencils with enougth power to puncture cardboard and wood
The illusive bow part of crossbow still remains able to evade me
I managed to bend my bow to the point I needed but it snapped soon after, I also tightened the trigger by wrapping the small elastic band around it to make it better and able to hold more power than the previous iterations
I plan to make another bow if im able to
(the school is on to me)