When my father died he left an 87a action but no stock.
I found a tennite stock on eBay, but it only had one takedown screw included. And I couldn't find a source for the other one. So I made one out of an 8-32 screw & a couple of nuts jammed together. The nuts were necessary to keep the action together. It worked well for a while.
A few years later I was shooting it with a friend at the range and it went full auto, dumping almost the entire tube mag in less than a second and then jamming. The jammed nuts on the takedown screw weren't so jammed anymore, allowing the action to come slightly apart. I put it aside and when I got home, and created a custom takedown piece based more on the original design so that it wouldn't come loose. That, and some blue loctite to hold it together. Now it works as it should and it hasn't come loose since.
It was amazing seeing how quickly it would dump a tube mag.