Quote Originally Posted by m_c View Post
The Coventry Easy Change system was fitted to lots of machines, however it doesn't use a pullstud, which is why my money is on some form of Boxford specific custom holder.
Boxford aren't exactly renowned for using established standards.
The presence on the Boxford holder of the locking ring groove in the same place as on the Coventry holder when with a pull stud it isn't required makes me suspect the Boxford is a modified Coventry, anyone conversant with, say the BT30 holders would recognise that the slot is redundant and that it would be absent on a fully custom-ordered part ;-)
Also there are the suspiciously thin walls above and below the tool changer disc slot, intriguingly designed to fit into the standard Coventry holder drive disc size and position :D

I'll put a fiver on the Boxford being a modified Coventry