Our previous 5er, also our first, bringing it home I was surprised at the amount of chucking I had. Installed the Teflon disc on the recommendation of a friend and it became smooth. On our current Monty that has a Morryde pin box I started out with the disc and no chucking. I would guess you replace it when it's worn so thin it starts chucking again, that is if you own your trailer that long.
I would suggest you try the disc first and see what that does. You may be good to go for less than $10. If you still have chucking then to on to the more expensive solutions.
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Jim & Deb
50 years happy
2018 Montana 3731FL
2017 F-350, psd,4x4, lariat, c-c, swb, srw
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