There is 3 button head screws around the locknut. I've concluded that it must be the qc30 flange because the locking nut only has a 47 mm hole in it so it wouldn't even take the 50 mm flange that a int30 has. but i did some test with some high spot bluing and found that I have no contact on the big diameter portion of the taper so I definately have some wear causing bell mouthing on the machine taper I'm having a spindle grinder come take a look |