First featured in Citadel, this lift is the smallest a wheel lift can get, so small that it doesn't really resemble a wheel. It uses these small wheels and has them stacked up. The larger wheel lifts use a track with two rods/strands of tubing, but this one uses one. With the way I have it built it uses two medium yellow gears, so it isn't very ideal to make it very tall unless you use chain or different gearing. This lift is best when it's a red rod to two red rods tall, and it fits in small spaces nicely.
Currently, this lift is in my ball machine Citadel, which is still under construction. Click here for the update video
that shows this lift working. The picture above is from Citadel's construction album