Mate, Look up what exactly PN 739A is... or what NPT is. While it might not be obvious to the naked eye because its a tiny and short thread, its tapered. If you want to get technical, the taper is just under 1.8 degrees...
Nice .........real nice .
Just got home and checked the leak. Its dark so nothing conclusive.
Hey Beags,
Who needs those fancy micrometer thing-amy-jigs anyway!
Or the modern version " I reject all reality and substitute my own"
Primary Oil Leak Update
Cos I cant fit my fukin head under the bike an have a look Wideglider.