Hi David,
I've used a 63mm 5 point face mill on the WM16 for a long time, it's perfectly alright with it so long as you keep the rpm high on large areas.(I've used it to face 2.5" square T6) I wouldn't go back to fly cutting, face mill greatly reduces the load on the cutter. I think mine also comes from RDG, i must've got the biggest one i could! Definitely was a good buy i wont regret. I'd even consider one of the smaller ones for good measure.
The manual sounds correct as i'd say 95% of the time it works perfectly fine, but i'd definitely rule out some of the industrial sized ones.
Michael W
Edited By Michael Walters on 13/07/2016 10:17:58