I got tired of the fuselage swaying and rolling back and forth while I was leaning over the gunwales working on something, so I took out the tailwheel fork and built this rig… it's just a plastic bucket filled with concrete, with a dowel sunk into it.
In the middle of the concrete glob is the business end of a toggle bolt, and the dowel is drilled to accept the bolt and act as a guide. After letting it cure for a day, I ended up with the world's heaviest nutplate.
To dress it up a bit, I cut a disc out of some scrap particle board.
Another piece of drilled dowel goes on top, and the tailwheel fork slips over it.
I made a wooden washer and bolted the tailwheel fork into the bucket of cement. It's now so secure that it might as well be anchored to the floor. I don't know why I didn't do this a couple years ago.