My old Marantz tuner hums louder after I cleaned the dial contacts

Took apart my 1978 Marantz 2230 last weekend to fix scratchy knobs and suddenly the transformer hum got way more noticeable. Turns out I had the ground strap on the wrong post the whole time, reattached it and the hum dropped to almost nothing. Has anyone else had a ground strap flip on them after a simple cleanup?

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