Well, this was not bought, but I regularly do buy and use insert nuts. The ones with an Allen key slot are somewhat OK to screw in, but the ones with a slot I do hate with a passion. So yesterday I decided to do something about it.
I had some nut drivers for a drill (i.e. 1/4" hex shank) laying around doing nothing. I cut some hex bolts to a length of 11 mm [1] and glued them in with epoxy after thoroughly cleaning the sockets and bolts (I used the activator I showed a while back for that). To prevent marring the wood I glued a nylon washer on top of the bolt heads. This morning I tried them out and they work great! The bolts really do not get loose. I think I'll use these a lot in those cases where I can't bring the work to the drill press. Probably even on the drill press as well. I have one each for M4, M5, M6, M8, and M10 now.
![Big Grin [big grin]](https://www.festoolownersgroup.com/Smileys/default/biggrin.gif)
[1] The insert nut for M4 was 10 mm long and I added 1 mm for the nylon washer. My OCD compelled me to make the rest exactly the same length and 10 mm is long enough to withstand the forces exerted on the threads for this type of use.
![Embarassed [embarassed]](https://www.festoolownersgroup.com/Smileys/default/blush.gif)

[Edit] For those interested: M4 requires #7, M5 requires #8, M6 requires #10, M8 requires #13, and M10 requires #17