Quote:
Originally Posted by Alasdair
I'll try first brushing it out to see if there's any debris caught in it. I'll have to see if I have a suitable wire brush first! Thanks again, Alasdair
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Try a straightened out paper clip with the very end , say the last 3mm bent at 90 degrees to serve as a hook type scraper for the thread grooves. Also look for any dent or deformation at the thread start.
Best
JA