Screen Spline Spacers.
Recently, while building cabinet doors, Doug Chasse of Kittanning, Pennsylvania ran out of “space balls” to fit in the grooves on the stiles and rails. Instead, he used ⅛ window screen spline. The screen spline can be used in short lengths or long strips.
Mike Aicklen of Mandeville, Louisiana uses a self-healing cutting mat on his workbench surface to help check projects for square during glueups. The mats also have 45° and 60° lines marked which come in handy for quickly checking miters.