Fairly weak, needs a bit of fiddling to get it straight and accurate. There are no marks on the back when lined up as a whole. Only the slit that runs the full length of the back is quite wide. I took a felt tip pen and marked the slots so that each time I lined up the hole pretty close. There's really no good way to fix this. The template wants to slide everywhere so I took two clamps and clamped them where I could or holes would be everywhere. To adjust the depth of the hole, loosen the two screws and the square head screws, which are clearly too short to adjust frequently. The bolts break when first tightened and the square head bolts fall out almost immediately after loosening. My first few holes were awful and didn't line up, but after a few more tries I get the holes pretty close and accurate. Nothing professional but makes the job a little sloppy. I would suggest spending the money on something more comfortable, if only for the quality.
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