Being new to pocket hole joinery, I purchased (what I hoped to be) a decent jig. The jig absolutely has to be screwed into a board, which is then clamped onto the workbench. This stops the jig from moving around during drilling. The jig's manufacturer was insightful enough to pre-drill holes for this purpose. It should have included five screws for this purpose, but I had plenty laying around. My setup only used four of the jig's five screw holes. The manufacturer included several helpful scales, printed onto the jig in white ink. So that tells me that the manufacturer has the capability of printing text and lines directly onto the jig. So what was the manufacturer's serious flaw? There are no white lines on the top of the jig showing the position of the center of the drilling cutout. Such lines are important to align the workpiece so the pocket hole is drilled exactly where desired. Without an index line, I had to 'eyeball' my workpieces, and many of my pocket holes are off-center. I can live with that because nobody will see the pocket holes on the fully assembled, finished project. But there should have been index lines printed in case alignment needs to be precise. This one error in the jig's design is a big disappointment. Hey manufacturer . . . do better !
Dr. Dave 
