On Wed, 02 May 2018 14:20:06 -0700, OFWW
wrote:

On Mon, 30 Apr 2018 17:26:44 -0700 (PDT), DerbyDad03
wrote:

On Monday, April 30, 2018 at 5:01:04 PM UTC-4, John S wrote:
"DerbyDad03" wrote in message
...

On Monday, April 30, 2018 at 12:18:38 PM UTC-4, Electric Comet wrote:
On Sun, 29 Apr 2018 19:11:55 -0700 (PDT)
DerbyDad03 wrote:

Perhaps I misunderstood. If so feel free to clarify.


diversity of thought is good


cut the hole for the collar in the top piece

line up both pieces
use collar upside down as template for hole in other piece

Laminate the pieces. Cut the small hole. Use it as a built in template to
cut the large hole.

6 of one, 1/2 dz of the other. All depends on what bits you have
available.

These all sound more complex then they need to be. Clamp two layers of
plywood together. Drill pilot holes through both layers at once - no
eliminates layout issues. Separate the two pieces and drill the right size
holes in each. Laminate.

Do you have a 6" and a 6 1/2" hole saw that he can borrow?

Hey! I do and they cut cleanly with their diamond tips...........
through concrete.

If you made out of concrete board no worries about it getting wet.