The guide keel has NOTHING to do with lane changes.
Standard slot cars have been converted to Pro-X using a standard guide flag.
The long pro-x keel is used for the lapcounting holes AND to operate the sliding magnet. So when the car drifts out to the side, the magnet stays above the rails. This works VERY well and even though it is differnt from standard slot cars, it is a defiinte enhancement. Before the floating magnet, if a slot car drifts to the side, the magnet is no longer over the rail so the car lets go. With the sliding magnet the cars have the grip of magnet cars but drive like non-magnet cars. Its nice.
This is not needed for lane changing.
If you convert a standard car to pro-x you will need to drill holes in the guide flag for lapcounting.
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