I hope to fix this broken row counter for a bulky knitting machine

I hope to fix this broken row counter for a bulky knitting machine. There is a lot of discolouration on the second one! I might also try to brighten

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Official Sentro Partner - Sentro Knitting Machine Row Counter - Replacement Parts — Click and Craft

I hope to fix this broken row counter for a bulky knitting machine. There is a lot of discolouration on the second one! I might also try to brighten