You want to use an X-acto knife to split a balsa cone. If you cannot cut all the way thru, start with X-acto and then go to sharp kitchen knife or pocket knife. The blade should be thin enough.

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Lee Reep
NAR 55948

Projects: Semroc Saturn 1B, Ken Foss Designs Mini Satellite Interceptor
In the Paint Shop: Nothing! Too cold!
Launch-Ready: Farside-X, Maxi Honest John, Super Scamp