Guitar Action (String Heights)

Yes, but that is a poorly made nut that needs to be fit correctly. I would consider that different than adjusting action at the nut. I was assuming a nut that was installed correctly but needs a little tweak to player preference or time.

According to the internet you have to acclimate your guitar to your environment for a month then take it in and have it set up. Like I said earlier Iā€™m glad I learnt how to set up guitars from a professional

Iā€™m not saying it does, only that I believe this is where the idea came from. Itā€™s typically quoted for relief rather than action, so as a percentage itā€™s more relevant, but still, imho irrelevant.
I tweak my set up without feeler gauges these days - I know how I want my guitars set up and generally go by feel.

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I guess youā€™ve never played a Martin Guitar before.

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Following bad advice off the internet and messing up a guitar can also be expensive.

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Really? I always thought you want a slight front-bow (or "up-bow) as itā€™s sometimes called. You want the neck to be slightly concave?

Just to be clear, ā€œback-bowā€ seems to be defined as when the neck has gone past flat and the fret-board is starting to be convex.

Cheers,

Keith

This is not accurate. You will want to capo the first fret, then fret your highest fret and check the bow about the center of the two points. This should be where the neck deviation will be largest. just be close to that point and then be consistent on that guitar when you check again another day. If you fret the 12th and check deviation, then you are fretting at about the max neck deviation on some guitars and the error in measuring the 7th will be nearly as high as your deviation, making your check questionable.

Checking the 12th fret makes the most sense here. 12 is the physical center of the scale length on all guitars.

I was taught Back Bow was bowing towards the back (as in Bowing down) So I checked, I guess thatā€™s another thing the internet has changed.

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It was taken up way before Chris went

I assume there are new strings sent up sometimes

This is how Fender advises to adjust the truss rod on a Strat:

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Hereā€™s an easy-to-follow guide on how to measure the relief, the action and the bridge saddle radius: