the nuts are 1/4 nc. just grind a centre point on one end and insert it with the point towards where the panel will be. fasten the panel in several points and give a little tap with your hand on the panel where the point is. take the panel off and drill it
ron

http://s908.beta.photobucket.com/user/padresag/library/turned%20works
http://s908.beta.photobucket.com/user/padresag/library/furniture
and a little history of where I come from
http://forum.woodenboat.com/showthread.php?156542-old-boatshop-in-Steveston