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I recently ordered/received a 20" bar for my Stihl 039 and the Light bar was shipped instead of the eMatic I had ordered.  As soon as I removed it from cardboard sleeve I noted the sprocket tip would spin maybe 1/3rd of way before it began to bind; after another 1/3rd it became just about impossible to complete rotation.  I Googled this to read it is not an uncommon snafu, and I attempted the "roll tip on a carpet so it turns and will hopefully loosen up" with zero success.  The good news (?) is dealer took bar back with no argument and replaced it with one -- we checked -- a free-spinning nose.