David Taylor
Western Thunderer
...OD is 7.94mm and etched hole is 6.1mm so they do need to be bored out a little, not sure of the best method to do this, suspect a drill will grab the thin etch, tried a hand tapered reamer and after 5mins only opened out an extra 0.3mm, I'd of expected more from a brand new reamer.
Hmmm, you were turning the reamer the correct way?
suspect I wasn't being man enough with it LOL