^ I can just about reliably do a three flute countersink by hand so all 3 flutes cut well, but clearance on a drill flute, yikes, that's getting tough.
I do have a rats tail dresser though and its kinda usefull for little groves in grinding wheels, i have been known to dress a SG wheel, then mag a large block to the table of said SG and use it as a some what over sized bench grinder. Sure guarding leaves a little to be desired, but needs must and i can still count to 10.
It kinda always surprises me how in this trade no one ever considers human hand movements to do some of this kinda stuff, half the stuff i turn has features added by some weird form tool i have ground then diamond lapped to perfection. Maybe im odd, but i grew up wood turning, to turn, you need a decent single bevel on the chisel, what ever its cross section, has to be once smooth single bevel, if you can't get that on a tool from the bench grinder then you don't have the skill - hand eye coordination to do at all well turning generally either.