I have seen many guys struggling to balance a prop by scraping or sanding down the heavy blade. This is especially a problem with the electric or slow fly props, because you do not have that much material to scrape away (blades are lighter & thinner on electric props as you do not have the same vibration/eccentric forces than on IC motors).
What I have found to work best is having a small can of clear aerosol spray lacquer paint handy - simply spray the back of the lighter blade until it balances! I have been using the same can of paint since 2002, so it is worth investing in a can of paint.
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