Jonathan Ganz wrote:

I'm not sure what you mean about leaving a tapered area
around the hole. Why would this give it better bonding?

Feather the edge so it looks like a shallow countersink. It'll give a
greater surface area for adhesive to bond to, and, if you're filling the
space with something solid, make it large and feather it to match. The
instructions on tins of car body filler give an idea of the shape.


--
Wally
www.makearatherlonglinkthattakesyounowhere.com
Things are always clearer in the cold, post-upload light.