15-03-12, 07:42 PM
(This post was last modified: 15-03-12, 07:42 PM by Falcon 269.)
The correct tap is the one I showed above. With that, the thread will cut like a hot knife through butter. If the one you've tried isn't cutting like that, it's either knackered or there's something amiss with your technique. 
At the risk of asking a dumb question, you are using grease on the tap ... ?
At the risk of asking a dumb question, you are using grease on the tap ... ?