I prefer a trim ring on any metal can imbedded in wood. About the only time I don’t think they’re necessary is when the pickup is mounted in the pickguard, and even then a trim ring still looks at home around a metal can.I have decided I like having trim rings when using vintage style pickups on a thunderbird:
before:
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After:
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…and chrome on black is pretty too:
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Not crazy 'bout the color, but...