A good temporary one is to take a shoe box and cut a hole in the bottom 1/4 the size of the egg you want to candle.In a dark room lay the egg over the hole and then hold the box over a 75watt light bulb. more permanent one ....build a box out of wood that is about 5"x5" square and about 10" tall with a bottom on it.Drill a hole 1/4 the size of the egg ya wanna candle and set the box over an el cheapo light fixture mounted to a board with a 75 watt bulb in it. You can have different tops for it with different size holes to accomodate various eggs.