Step 5Supports
iImage Information

Large bases do not need supports, just a big rock inside is enough. But these rims were not flat underneath and a bit smaller than the other one. The pipes came from decommissioned and dismantled telephone poles. They had to be slightly notched to fit under the rim's lip. The middle ring is important, the rods start to concertina after a while. In the beginning I heated them up in the course of welding them on the vertical bars and bent them around like that (see pic in intro). It quickly became apparent that it is much easier to bend a second ring and not join it when doing the top ring, and it's much neater.