Actually, I have several different tapping oils, for different metals, some are runny some are sticky, so I defer to the experts, I just buy the stuff (https://www.largescalecentral.com/externals/tinymce/plugins/emoticons/img/smiley-cool.gif)
The stuff I use the most is runny, and helps flush chips out while tapping, which helps from jamming. I use Tap Magic Pro Tap, and the little metal can in the picture, and they have made this stuff for years:
This is another one of those specialized products that work great and have been around since 1953, my grandfather used it, my dad used it, the aerospace engineer across the street used it, etc.
Noel, on the hillmans: Watch ebay, you will find used ones there, and also people making copies… also used Split Jaw and there is also a clone being made… I just ordered 100 SJ from Robby to have spares since SJ is going going gone…
Greg