[0, (peg_main_dia - $peg_outer_slop)/2],
[peg_straight_len, (peg_main_dia - $peg_outer_slop)/2],
[peg_main_height, (peg_max_dia - $peg_outer_slop)/2],
[0, (peg_main_dia - $peg_outer_slop)/2],
[peg_straight_len, (peg_main_dia - $peg_outer_slop)/2],
[peg_main_height, (peg_max_dia - $peg_outer_slop)/2],