I had a couple brittle adjusters on the burb when I put in the new lights. I ordered this ten pack that seemed to get good reviews.
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First one split:
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Fortunately I have a 1/4NF28 tap to precut the threads.
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It worked well, but I’m not sure what I may’ve done wrong. All the adjusters I’ve purchased before were dormans with the screw already threaded into the plastic.