If you have removed the brass insert, put it back in.
Now you will simply super-glue (or J-B Weld, or whatever) the first nut to the outside of the brass insert - the 10-24 nut I have used actually fits pretty much perfectly within the plastic circle. Be careful to use as little glue as necessary to get a good bond, and do not let it block or gum up the threads in any way! (and if you do get a little messy, remember that fingernail polish remover removes super glue).
Note that the screw hangs a bit after install, which is why we'll add another nut or other support in the next step.