Wasn't aware that David also sold books, must go and have a look.
Whenever I am looking for a book I must admit The Book Depository is my "go to" site.
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Was doing some threading on a barrel today and forgot to put the collar on the 12mm external thread whilst I was threading the internal 10mm thread, crack she said.:~:doh:
Have done quite a few now with the threaded collar, none of which have cracked, this was my first one without putting the threaded collar on. Guess that proves you need it.:B