Advice on A3HSRmi

Dear All

very glad to be here,
My name is Simon and I'm a tech at a London comp
3 Boxford HSR routers apparently appeared in the department after the school got refurbished (an unconsulted top down decision)

I would be very grateful for any advice to make them useful to the department as I haven't used Boxford before

Setting origin/datum on surface of material :

Boxford guy said I could use a button combo on front panel but I didn't quite follow
does anyone have any more info or point to a manual on 'hot keys' like setting origin ?

Is there a Z0 sensor that would work with it or way of customising to use generic sensor ?
ditto hand controller

where would be the best place to buy collets/small radius cutters a less cost than boxford direct?

Many thanks for any help: I would love to get the kids using these machines

Simon