I received a d-way 1/2" spindle gouge and about to make a handle but the what size is .515. I'm concerned that a half inch hole will cause the handle to split. Looks like I need a 33/64" or 13mm bit, neither of which I have. So, will the handle crack/split if I use half inch? If so, do I order a 13mm or 33/64? Assuming someone here has done this. Thanks.