Lateral balance is very important. If the wing isn't balanced, at slow speeds the heavy wing could suddenly drop andyou have stall! I use left over weights from tire balancing for cars. I found a garage that that puts the used ones in a coffee can and I can have them for free. I just cut the lead pieces off the metel bracket. I stick o a few pieces near the outside rib of the wind tip that needs weight with electrical tape and check the balance. When I have the correct weight, I slice the covering beside the rib and use RC56 canopy glue to glue the weights to the rib. Levae it overnight to dry and then put a patch over the opening. Canopy glue stays flexible and won't let go which is why its better than epoxy in this case. [8D]