What's to register? The holes are often drilled AFTER the SS board is etched. He's only exposing/developing/etching one side. He said he's drilling his holes by hand. Registration is an Eyeball or maybe a drill-sharpness problem.

What's key is that the board maker has, in this case, no knowledge of what he can or can't do, since he's not made a number of increasingly dense sets of lines in different areas of his board. That would tell him when his agitation and temperature control are "right."

RE