Clamped 2 2x4's 5.25” from the edge of the table. I added the one 2x4 behind the one that is 5.25” from the edge of the table. First slat I did the 2x4 was flexing in the middle. Got the holes to line up much easier on this L/H inboard slat. Put four straps around the table and slat. Kept tightening until the holes lined up. Cleco and installed A4 rivets.