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Index sprocket

I have an older 550b and just started loading larger batches of pistol ammo. The index sprocket has sharp points and rough edges that by the time I load 400 rounds it feels like I have a hole in my thumb. I saw some newer pictures that look like the sprocket has been upgraded, I wanted to be sure before I ordered a replacement.

A fine file for any sharp points.  A few minutes  with 600 wet/dry paper will smooth up those rough edges. This will produce a better, much better, than a replacement part. 

No design changes have been made to the index sprocket.

Does anyone know the part number for a replacement index sprocket?

13720

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