Grandson helps keep the work clean and cool

Around June 25, 2015, my grandson came over to help me with the countersinking on the spar for the attachment of the fuel tank.  I found that if you keep the microstop and bit, clean and cool, it will give consistent depth of countersink.  My grandson is using the air tool to continually blow air over the work to accomplish this.  Not only is it much easier this way, but he loves it and I get to spend good time with him.