Today I started to drill the holes through the lead weights. I started with a #30 bit so that I could keep the holes lined up with the aluminum counterbalance plates. After; the #30 I moved up to the finished size of 3/16 inches. I used a pecking action and some candle wax as a lubricant and had no problems.
Welcome to my builders log for Sonex S/N 767. It won't be as big as a real 767 but if you scale the speed I bet it will be almost as fast
Dave's Sonex Builders Log 