[quote=Morty426]Can you post some pics?

I'm not sure why you would need to drill holes for mounting of drains. Is your baseplate and adapter ring not made of metal?

I should have said the shaker bubble didn't have any holes pre-drilled. I've seen some pictures of other's bubble, and it appears some of the holes are chamfered. My bubble is
just flat around the perimeter. Thanks for the reply! Jeff