Yesterday I tore down my k'nex Wicked Twister model to make this k'nex 1st generation freefall. It has to be manually operated, because I could not figure out a way to make the lift chain pull the car up onto the transfer track at the top. There are no supports on the front part of the lift so that it is easier to push the car up to the top. Once the car is on the transfer track I push a lever to hold the car in place. Then I slide the car forward to the drop track and release the lever. The car goes down the ramp and gets slowed down by the brakes to just the right speed to roll right onto the second transfer track back into the station. The second transfer track is held horizontally until I pull a lever and it tilts back down into the station.
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The brakes are the pieces sticking up out of the track at the bottom of the drop.