Hey, Rick, I lost a nut, too! I had been storing the bolts in the wing's nuts when the wings were off and probably set it down too hard, knocking the nut out.
I got lucky so it was the rear nut which I was able to put & glue back using the access provided by the existing hole behind the spar.
Since the nut is plastic, I used gorilla glue- messy but effective. CA can do funny things to plastics and the nut seemed to be a "soapy" plastic like PE that doesn't take regular glues well. Gorilla glue foams up and encapsulates the part, so adhesion is less important.
My experience with building my own planes (Pre-ARF days) was that wood threads are better because you can always tighten them up with a coating of thin CA.
I was looking at (your?) post talking about shortening the wing bolts. I thought that I'd leave them long in case one backed out....
Guess what happened the other day? One backed out a whole inch!
So I drilled a little hole in each corner of the tabs and lockwire the wing bolts in at assy now. Bit of a hassle, but muuch less hassle than losing a wing!
Next I will shorten the bolts, as they won't be backing out anymore. I have reused the lockwires once now, just leaving them attached to one side and threading the bolt in with the wire hanging out. I would hesitate to use metal wire on 72Mhz because I don't get them very tight so there could be some metal-to-metal contact issues. i'm using Spektrum which supposedly has NO problems with metal-to-metal vibrationsaffecting signals. One of the tech leads at Spektrum talked about that at our club 2 years ago- the 2.4Ghz system doesn't even see that type of interference. If I were on 72, I'd probably use rubber washers under or rubber bands around both bolts, before they are fully seated.
Just a heads up for y'all- watch those bolts. This one backed out after 3 flights that day... and I am darn sure that I had tightened them- I am pretty methodical at setup, especially given that I push one wing down and lift the other up when tightening the bolts to get 1/2 degree error out of the wing-wing alignment..