The best way to measure for your TOM Strap Model 1963 (Acoustic) is to first use your existing guitar strap to hang your guitar where you want to play it.

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Using a cloth tape measure or string, measure from the guitar end pin to the area of the headstock between the first and second set of tuners. In other words, between the ( low E and high E tuners) and the (A and B tuners) as shown in the diagram.

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If you're using the end pin adapter for end pins with a 1/4" input jack, then subtract approx. 2" from the measured length.

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The TOM Strap Model 1963 (Acoustic) is adjustable between 48-55 inches.