Thanks for the suggestion that were posted after my inquiry.
Well I've tried the string with the peanut butter trick. The foot plate comes with a hole at the end so it was easy to thread a short length of cotton kite string through the hole, tie a square knot in it, and cut the string leaving about 3/8" tails beyond the knot. I really worked the peanut butter into the threads of the string and put a healthy dab on the area around the hole and toothed part of the foot plate. I've had 2 failures. Both times the string and foot plate look as though they were put through a dish washer! That's one agile tongue on that critter!
I know that the trap can snap, because very gentle pressure with the end of a screw driver, or even a firm nudge of the entire trap causes it to snap.
I know that I've got something bigger than insects because just yesterday I clearly heard loud fast scratching sounds coming from behind the wallboard on the common wall between the garage (where I've set the trap) and my dining room. They stopped immediately after I pounded the wall once with my fist.
On to the piece of chicken as bait. If that doesn't work, I think that I'm going to have to try a different type of trap. Unfortunately, when I read the on-line user comments about the other common types, there are many complaints for all of them about failing to catch anything but droppings.