Contraption segments

Overview
Contraption segments are small fragments of Contraptions that do nothing on their own, but make a contraption if they are put together.

Triggerer
A triggerer is a segment of a contraption that automatically launches a shell when the contraption loads. To build it, place a horizontal spring. Then take a spiky shell (not a spiny) and place it on top of the spring.

Brick-based P-Switch trigger
A brick-based P-Switch trigger will trigger a P-Switch when it's brick block is destroyed. This is because of the muncher, which will fall onto the P-Switch. This contraption segment could also use a breakable block (like an ice block) and a bob-omb to break the block instead of a brick block and a shell.

POW block trigger
A POW block trigger is just a singular POW block, and will be triggered if a shell hits it.

Question block trigger
A question block trigger is just a singular question block, and can be used to connect multiple contraptions to eachother. For example, a question block being hit could bump a horizontal spring into a shellmet, acting like a triggerer.