This Lap Joint is a simple Vee shape with a 75 degree angle between the blades. The lap is made using 4 pieces of 1/8 inch hardwood boards. from Panama. The boards on the upper surface are Amargo Amargo. The boards on the lower surface are Cabimo. My father was a pilot and tug boat master in the Panama Canal Zone. The Marine Division had a woodworking shop to make hardwood furniture and ship bumpers for the tug boats. In 1985, my father had the shop cut several boards down to 1/8 inch thickness and then he sent them to me. I only had enough wood to make this single lap joint which was precious to me because it was from my native country of Panama. This lap joint is slightly heavier than most lap joints. Amargo Amargo has a similar density as Ebony and it is difficult to machine because the wood sucks up microscopic pieces of quartz and this wears down wood working machinery, but the wood is great as a bumper between tug boats and ships. It is in new condition. I only threw it a few rimes to make sure it was a good flyer before retiring it to my collection.