Sherman, Yes, what I said is 100% correct. If the tape is 1/2" wide, the plane will balance - that is, it will sit level - if you have the balance point ANYWHERE within that 1/2 inch.

Look at it this way. Instead of using tape, imagine putting two strings on EACH wingtip that are 1/2" apart.

Now, let's look at two senarios:

In the first, the balance point is 1/8" behind the forward string, and in the second it's 1/8" forward of the rear string

In #1, there will be more pressure pulling on the forward string, and in #2 there will be more pressure pulling on the rear string, but in BOTH cases, the plane will sit level.

A piece of tape will give you the same results due to it's width.