I put a long angle across the longerons up against the front of the F605/roll bar. The fuselage is setting at 89.3 degrees, so I clamped a vertical angle at 89.3 degrees and measured from the angle. Because I clamped the upright angle inside (forward) of the side to side angle, I had to add 1/16 to the final measurements to account for the thickness of the side to side angle. So, to correctly position the roll bar, it needed to be 2 7/8 plus 1/16, or 2 15/16 set back from my upright angle. I clamped a metal yardstick on the top of the fuselage as well as up tight against the back of the roll bar to hold whatever angle I needed. Trial and error ended up with 2 15/16 which is really 2 7/8 when I remove all the positioning angles. I was also very excited that when I measured the height, it was exactly 17 7/8. What more could a guy ask for. I mixed up a small amount of JB Weld and filled in the tooling holes on the forward half of the roll bar amongst the connecting plate flush rivets plus a very slight gap between the two halves. Then, I quit for the day. I can repeat the tilt back measurement easily after I remove the roll bar to drill the mounting angle bolt holes to 1/4 size tomorrow, so , off comes the roll bar. Wow.
My measuring contraption.
My setback is 2 15/16 on the ruler which is 2 7/8 because of the upright angle being forward 1/16 in.
Har to hold the tape and take a picture but it is exactly 17 7/8 high.
