• PTFE tape is used to reduce thread friction and enable a greater clamping force.

    I think it has to be worth a try in your case - fit the bb with plumbing tape and take it for a ride round the block and see if it comes loose....

    Your first paragraph is incorrect. Any clamping force is between BB and flange. PTFE would have no effect. It is a sealing tape. However the second paragraph is worth a try as the tape may well fill the gaps in the worn threads and stop the thread pulling out as you tighten.

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