Place the middle disc flat on the ground with the support bracket facing up (that is, the bottom of
the disc facing up).
Invert the bottom disc with the two attached half drums onto it, so that the free ends of the half-
drums line up along the marked diameter line the same way as on the bottom disc. The pattern
will form a mirror image of the bottom disc.
Drill holes through the drilled drum brackets in both half-drum edges into the middle disc.If you
bolt through some of the holes to assist in drilling, remove the bolts when you are finished.
Remove the bottom disc and half-drum assembly.