I think he means fixing the hole in the old driver, not trying to fix the defective new one.
Depends on the hole size and type, Fonsguy. I fixed a bextrene cone (not trying to correct your spelling, but you asked) on a LS3/5A by patching from behind with very thin cloth (so as not to add weight), using contact cement to secure it, and kinda molding it with my fingers over a baseball to get the curve right. That still left a big ugly flaw in the bextrene coating in front. I cleaned up the rough edges with an Exacto, used a little black silicone sealant, and kinda sculpted it with a chopstick to give it a similar texture. The color was a great match and the patch was pretty much invisible, even from inches away.
I could always see it, of course, even from across the room, because I'm the idiot that put the hole there.