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No, turning the magnet around makes no difference whatsoever. That's like saying if you turn a chocolate biscuit upside down then it tastes better
You can buy thin magnets on Ebay and then fill the gap with strong cardboard or styrene as a shim. Make sure you buy magnets of the correct measurement as most Ebay sellers do not fit Scalextric cars even though they say they do.

You can buy thin magnets on Ebay and then fill the gap with strong cardboard or styrene as a shim. Make sure you buy magnets of the correct measurement as most Ebay sellers do not fit Scalextric cars even though they say they do.