Welcome to the forum.
If you are asking about the red and yellow insert rings, then yes, you can remove them.
I am not sure if you mean to remove the black 9 X 11 insert plate?
To what would you attach the router?
You can set the cutter below that plate and then raise it through the plate to cut a zero clearance hole. You will then need another black insert plate to use with the red and yellow rings...
OR, you could make a new insert plate out of 3/8" acrylic with a 3 1/2" clearance hole just for the large chamfer cutter.
I have a similar cutter, but I have a 11 X 11 Oak Park plate with a large opening.
I don't mind if other members disagree with my comments.
I don't profess to know everything, and I may learn something new.
"Never attribute to malice that which is adequately explained by stupidity."
Last edited by jw2170; 04-05-2014 at 08:31 PM.