I would put 0 if possible. Open box The block is full of dents on the back of the clutch. I don't pay attention to it as it is a tool and not a decorative element. I then approached the trailer with the correct ball and bow hitch when it was in the straight position. That way it will bind every time you turn around. This is on a standard PJ car trailer then I tried my closed trailer and same thing. Well, in terms of bullet swapping, that's great, but if that doesn't work for followers from regular manufacturers, one wonders what else will fail about this unit over time. A seriously overlooked issue that shouldn't be a problem.
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