Step 2Shorten the cage
With a hacksaw or angle grinder remove the top of the cage by cutting the vertical bars flush with the next horizontal bar down.
Remove any sharp edges with the angle grinder or a file to prevent them from rubbing through the plastic liner.
Cut an inch or two out of one of the short sides of the ring you've just cut off and weld back together. The steel is quite thin so it might help to insert a chunk of steel bar inside the joint
to give you something to weld to. I guess if you didn't want to weld this bit you could drill through lot and bolt or wire it together instead.
Slide the ring into the top of the cage so that the short vertical bars are wedged inside the bars of the cage.
Note: One side of the ring will have the vertical bars on the outside of the cage - don't worry about this - it's covered up later by the roofing iron and it leaves enough room to get the tank back in.
Wire the ring to the cage using soft steel wire (I used the mesh segments from an old single bed frame and folded them out to use as ties)
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