Gerrit,
Well they had a bit longer than 20 minutes (nearer 35) and were then dunked in some nice unused Duckhams Q 20/50 oil.
They came out more of a gold colour.
Have just made another 7, this time 4 with M8 threads and 3 with M6 threads. These will be cooked tomorrow.
Should have a good enough range to be able to hold most things to the table.
Colin