I had a spinning basin tap so tried tightening the ancient plastic back nut which disintegrated.
I ordered a brass replacement. The thread engages but binds up after 2 full turns. If I flip the nut and thread it on the wrong way round the same happens. This makes me think the thread form is correct but the pitch is wrong. The threads on both parts look clean and undamaged.
I thought 1/2” inch is the right size back nut for basin taps. If it isn’t, how do I find the right size back nut ?
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