Thanks all. Even 28 wraps of PTFE still had a drip after a few minutes. Managed to get a good seal with a good few wraps of sealing cord. Loctite 577 wasn't available near me at the weekend.
A few posts on other fora suggest bonded seals and they do look the ticket, but A: I don't know how long I can expect a nitrile seal to last, and B: should I fix what ain't broken?
Thanks all. Even 28 wraps of PTFE still had a drip after a few minutes. Managed to get a good seal with a good few wraps of sealing cord. Loctite 577 wasn't available near me at the weekend.
A few posts on other fora suggest bonded seals and they do look the ticket, but A: I don't know how long I can expect a nitrile seal to last, and B: should I fix what ain't broken?