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The two pins are very similar to look at apart from the colour. However, the modern service part for the 1.75mm pin is now a brass colour too. So it’s now impossible to look at a pin and decide its diameter. The only way to let them apart is to measure the diameter with a micrometer or try them in the guide.
The only really certain way to ensure a match is to replace the Scalextric guide and pins together as a complete guide assembly
Another great insight from Scalextric Car Restorations
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