The Tourbillon performed well at the expo. There was a bit of slippage on the main axle driving the combined weight of all 3 frames but this was easily fixed by shortening an allen key so I could get into the hex grub screws and tighten them properly. The black Chinese allen key grub screws are very good. They have a dimple on the end and dig into the axle. If you do them up with enough force they actually imprint a circle into the rod!