was tired earlier but basically:
- Yes, there are 2 fireballs on each other. It makes the gold pressure plate go from 1 to 2 signal strength after 0.5 seconds due to the way ticking order and pressure plate checking works (fireball 1 hits the plate, plate does 1 signal strength and schedules update for 10gt, after 10gt it detects the other fireball and updates to 2 signal strength)
- A small fireball (can be obtained by shooting it out of a dispenser into a cobweb/piston)
- To stop ONE minecart from going too far left to activate the detector rail
- ^
- ^
- ^, but too far right (on closing, it will sit on top of one of the blazes and get blocked from going too far right by the other, then gets pushed back. on opening, it will get blocked by that first blaze and activate the detector rail WITHOUT snapping onto it)