The first step was to substitute the flimsy plastic for something a little more solid, like angle iron.
Now we have to put up a vertical bar to hold up the worm. I have that bar milled out, but you will have to wait, because this is the original Topsy. She just growed.
Of course, angle iron is neither square nor uniform, even though I milled the outside edges. It was very clear the worm-holding bar was way off vertical, a whole millimiter. So I spent some time milling out the place where the new bar will go.
Next step: square up the bar without moving anything. Then we will worry about the base, and if push comes to shove we will use shims to level it.
In retrospect, if I had a casting why that would be the way to go. But I have no casting facilities. But so far this has been very enjoyable. Stay, as they say, tuned.