One thing to note on the hanging tetras...

[tkwetzel]

Originally Posted by Billfred

They're PVC pipes, yes. But the tetra-maker plates are held in place by nuts and bolts. They come loose, and the pipe it is attached to rotates.

Of course, you can retighten it (I fixed one with my fingers), but when you've got 80 of the darn things around the field, that may get a bit unwieldly.

On the actual field pieces, the end caps will be glued to the pipe, so it will not rotate. And the bolts should be installed with loctite, so there should be very little chance of them coming apart during a competition.