when I needed nose weight, I usually tried to get it as far forward as possible and was able to use a bit less weight to achieve the same c.g. shift.

I drilled a hole into the base of the balsa NC, filled it with the necessary amount of lead shot (local sporting goods stores carry shotgun shells), and capped it with a plug of glue or epoxy. It always stayed put just fine.

If the NC is big and long enough to leave empty space in the hole, you can plug the hole with a short piece of dowel and have a solid hard spot to insert the screw-eye

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NAR 20602
used to be "powderburner" in another life