just been to B&Q to get 2 door handle (like those used in hospitals that can
be opened from outside in emergency) sets for bathroom and toilet.
packing says need suitable screw driver!.
you actually need a 54mm hole cutter & a 24mm wood drill (the flat type) +
sharp wood chisel.
i have a 56mm hole cutter will that be oversize? i have to go back to B&Q
for the 24mm wood drill (mine leap from 22mm to 32mm)