Finally getting back to my thinline project which has been dormant for over a year. The neck needs to have the screw holes re-drilled. I'm debating whether to go with threaded inserts wile I'm at it. Either way, I need to get a good center line on there so I can lay out the holes accurately. I clamped the neck between a couple square, straight boards. They are 1.5" tall, so they stand taller than the neck. They also hold the neck in a level position. At the heel end I used a 1.125" board to make a center mark. At the peghead end, I used a narrower piece to get a center mark on the peg head To draw the line, I clamped the straight edge at the peg head end. By using the long straight edge the center line is very accurate on the heel.