ORIGINAL: jetmech05
I do believe in CG machines, a pencil is a very small area to put the weight of your aircraft on. Possible to send the pencils spearheading through the balsa sheeting.
I use the same CG technicque as "fellers" with no problems. He and I place "V" shaped add-on erasers which work well up to about 9 pound planes when balancing on balsa sheeting. I do recommend tapeing a small square of 1/16 ply at the CG area when balancing heavier models.