Simplest, most secure fixing for plasterboard. Seems simple enough solution! If you figure it out, it would be great to see you put up an Instructable about it! Interset is just Rawl's name for it, there are many others. I am confused on what you are doing. I've done this with a variety of fillers, depending on the job, ranging from toothpicks on up. This will give you consistent holes and let you know how long to cut your pieces of dowel. The biggest benefit of filling the hole is that you can now reposition the new hole so that is partially overlaps without losing any strength which is not what I had to do and I didn't want to drill extra holes in my wall.
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