boring a timing gear

I have a 24 tooth nylon timing gear that has a 1/2 dia aluminum hub
thru the center and a 1/4 inch bore.

I'd like to open it up to a 3/8 bore to fit my NEMA34 single stack
stepper to drive a 72 tooth pulley on my drill press.

The setscrew is in a hub that is 0.875 inch dia so the screw will
have enought grab.

I am not sure if the 0.062" wall is too thin.

any comments ?

Dave