> Where can one find drawings of the "cam type" of wiring boards? Let me try to describe a simple cam. From plywood cut a piece with the shape of a comma. The circular 'head' of the comma may be about 2.5 inches in diameter. The 'tail' is the handle. Now drill a hole in the circular part of your comma. Be certain that the hold is offset towards the tail side.. Attach the 'coma' to your wiring board with a bolt with another bolt acting as the 'stop' for the other end of the frame. When the 'tail' is up the frame sides will be bend inwards, lower the 'tail' and the frame is released. -- Eric & Marnie Abell Box 87 Gibbons, AB T0A 1N0 Canada Phone/fax (780) 998 3143 [log in to unmask]