Hey anyone sick and tired of throwing their chain because you lost the master link retainer? Well trash the stock retainer and switch to circlips. I am constantly losing my retainer no matter what i do...So went to mcmastercarr.com and purchased hardened circlips for my 520 chain masterlink. mcmaster part number 99620A555. Pack of a hundred for about 9 bucks... I have not thrown a chain since!!