Step 1: Repurposing CD turntable
Step 2: Concrete Stepping Stone
let dry for a couple days
Step 3: Finding the centre
Place the framing square against the edge of the stone and draw a line, rotate along the edge and draw an intersecting line. where they meet should be your centre.
Step 4: Attaching the Lazy Susan
First I drilled a 3/16 inch hole through the turntable bottom.
Then a 5/32 inch hole in the back of the Stepping Stone with a carbide bit, using a depth stop so not to drill though the stone. Then attached the turntable bottom with a screw.
Using 2 of the existing holes in the turntable bottom I drilled 2 more 5/32 inch holes and used 2 more screws.
Flipped it over and done.