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https://www.masterblasterhome.com/showthread.php?17769-Stihl-201-upgrade-kit&highlight=201 All is in this thread.

They were shit, now they're good, let's all just move on.

Ok, my crap one is a 2012 serial no 1756049 the good one is a 2013 serial no 177114915. I know the numbers are different length but that is what was on them(I wore glasses and used a magnifying glass) Hope that helps