I have an older 550. Dirty and rusty and sticky with all moving parts. For my primer arm I dry tumbled to get rust off and greased the shit out it and got it all working again but I am looking at the bearing kit to make it smoother but I’m waiting till I decide if I’m gonna upgrade it to the 550c or leave it and get a 650 to go with it

Buddy of mine upgraded already to bearing kit and his is smooth as hell


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