Don Soderberg's website has photos of them in use, that I attached to the mentioned thread, but it's pretty simple. Cut the top off of a two liter bottle (or a 20 oz. for a hatchling), insert shavings from your dirtiest mouse cage (or if you don't keep mice; any pet store will give you some, and a funny look) invert the top, tape it in place, and put along a wall. The snake will often crawl in looking for food, and make its self comfortable. I use blue painters' tape for tape traps, duct tape is horribly sticky; I almost lost one I accidentally caught that way... masking tape too, is pretty darn adhesive.
Remember to put water bowls out along the wall edges to keep the escapee hydrated until capture. BTW, I've caught a lot more using the tape method than anything else. I've caught two in the bottle traps, and none using a cone trap I purchased at a show. I had 5 escapees this year, after only having one last year. I used a rack I bought from someone I trusted, and it wasn't as tight as it looked! But only two are still "at large," and I still have hope.
I had most of a clutch escape from the incubator a few years back (i think 15
), found all but two alive within a week.