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Having the washer slide down the adjuster screw doesn't affect anything. Bending the screw however, means instant death. If it's just the washer you're worried about, don't bother. When tightening, the adjuster screw's head does tend to come off it's seat, but when things are moving freely you don't have to turn it very hard to get the belt tight, and the head doesn't tend to creep off the seat.
In other words: Don't replace the screw unless it's bent or doesn't turn freely.
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