Clamp key and catch bar for Pollard tapping head

[tonyfoale]

On a side note, I think I read somewhere that there's a kind of slip clutch or some system for the head so it doesn't break a tap, is that right?

Yes there is a clutch but at what torque it slips depends on how much vertical force you apply so you could still break a tap but you have to try harder to do so.