No, just on heat only. The wet cloth, folded about four times, was pressed against the beech with the iron providing the heat on top of the cloth. I was stunned at how quickly the ding went.
Edit: the beech had not yet been varnished or oiled so the steam could do its thing easily. With a finish on the wood, I think could have been more messy. Probably best to sand it down to bare wood. I only discovered the idea from a very old copy of Fine Woodworking magazine last night. I'm no expert. Good fun though. I've been searching for dings all over the house.
Sad, I know.