i am looking at getting one of the Auto reversion tapping heads I have see on fleabay. Anybody got any experience of them and what's the best taps to use with them?
I have no idea about the eBay ones but I've used tap-o-matin ones and they are usefull once you get used to them. You need to use machine taps with them either spiral point or spiral flute types.
I used to own an auto reverse pedestal tapping machine, I flogged it as it was not getting used enough but I do remember it needed Jacobs Flex collets which were expensive.