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Use this part to press the hidden lane change switch inside your Scalextric Arc Air controller, as if it was a Arc Pro controller. Each set consists of 4 pcs, i.e. is enough for four controllers. A 5.5mm hole must be drilled approximately 13mm above the upper edge of the 'brake' button recess, and the Air to Pro button must be inserted in the hole. When separating one of the four buttons from the tree, the stem must be cut to ensure the inner part is long enough to reach the switch in the controller?
This is not a Scalextric product, it is not a toy, and it should only be used by expert modellers. Performing this upgrade will void the warranty on your Scalextric controller.