I have gone down the same road as you with the carpet from Lowe's. Unfortunately, the fibers do eventually work loose and get caught in your car's axle. The picture below shows the track when it was still carpet. I have since replaced it with EVA soft linking mats (also purchased from Lowe's) which works extremely well. My lane widths are 22" in straight aways and 24" in curves. I have recently purchased the Kyosho IC tag lapcounter home edition. I have not had time yet to install it but it seems to be the best option if not the only one for dnano.
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