2 storey compost bin!

Step 3 Making the concrete ring.

I originally made th ring in place on top of the bricks. It had 2 curved rebar round the outside and rebar that crossed in the middle to keep the inner plastic piece from falling down. The bin was set on top and bolts were pushed down into the wet concrete through the holes in the outside of the bin so that the bin would sit perfectly when the ring set up. Afterwards, i found that I could move the ring on my own.
If you do it, I recommend doing it on flat ground and moving the ring into place later. (Have someone help you)