• Acoustic Builds

  How to get a perfectly square neck alignment using the LMII/O’Brien jig

  Posted by Michael Minton on October 5, 2025 at 10:27 am

  I attach my necks using the LMII/O’Brien jig. No matter the method, there is no guarantee that the neck block and edge of the rim at the top is truly perpendicular to the centerline of the guitar.<u5:p></u5:p>

  I’ve just flossed when things weren’t quite right.<u5:p></u5:p>

  But now I take a long square, place it on the rim at the neck block and measure where the long square aligns on the top seam. I note Bass/Treble deviation at a known point (I use 290 mm). I have put alignment marks on the LMI jig on either side of the neck profile at 290 mm. I then move the neck left or right on the LMII jig exactly the amount of the out of squareness measured on the top prior to cutting the dovetail. Presto: a nearly perfect alignment with no (or minimal) flossing required.<u5:p></u5:p>

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  Michael Minton replied 5 months, 2 weeks ago 1 Member · 0 Replies
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