I am also in the building process. Haveing a good time and for the most part all is going well. I think what your talking about is making the tapped part stronger. Use super glue. I took a piece of lawn trimmer string to to dribble it down into the hole and it picked up some fuzz and became a sort of swab. Really made a difference. Just be sure to let it set up before you thread a bolt into the hole or use excellerator to set it. If you don't you may not get the bolt out again. I found a four tube pack of super glue at Home Depot for under $3. While they are small one tube did many tapped holes and that way they don't dry out as you use only one at a time as needed. Hope this is what you needed. Broken Balsa..