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I have a walden guitar which has a truss rod. It's action was high and I gave it to a music shop to adjust. They adjusted the neck but now the frets are buzzing a bit. Also I think that the action could have been adjusted by reducing the saddle height and I'm thinking of doing it myself.

When I check at ebay there are different kinds of truss rod wrenches and in different sizes (4mm/5mm). How do I decide what to buy? Can someone tell me based on my guitar?

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A comment rather than an answer. If you've paid for a job and it's not right, take it back. While there, ask what size tool is needed. –  Tim Jul 29 '14 at 8:49

3 Answers 3

up vote 3 down vote accepted

Well, you have two choices I guess.

1) Use a pair of calipers to determine the precise size wrench needed for the specific guitar you own right now. Or find out through some other means (e.g., by contacting the manufacturer and asking what wrench size is needed).

2) Buy a multitool which will have the right size for now and also probably for any other future guitar you could ever own, and never have this problem again. here's one example of a guitar multi-tool, though probably a bit more specialized than you need.

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One consideration for multi-tools is that the body of the tool -- which is large enough to accommodate the other bits -- may interfere with nearby material. In particular, I imagining either the soundhole or the headstock. In these cases, a "skinny" tool may give you the best range of motion. The classical guitar identified by your link may not have a truss rod, but if there is one, you will be able to access it via the soundhole. Get a small mirror on a stalk to inspect the inside of the body for evidence of a truss rod. Good luck! –  Kirk A Jul 29 '14 at 11:15

Your guitar appears to be a nylon-strung classical guitar, and as such may not have a truss rod.

However, it's worth going on to answer the question in general:

Unless you have a very unusual guitar, a truss rod tool is either a hex key or a hex socket. These are common fittings in all kinds of fields, not just musical instruments: bikes, self-assembly furniture, etc.

Paying $7 for a tool you're not sure will fit, seems silly when discount shops (and eBay) frequently have socket sets, or bundles of hex tools, for cheaper.

The only slight issue with this approach, is that some sets are metric, some imperial. Worst case scenario, you get a cheap tool that's no use for your guitar but will be useful in other ways for the rest of your life!

The manufacturer should be able to tell you the right size, if Google can't.

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Thanks, and yes it does have a truss rod –  Can't Tell Jul 29 '14 at 11:05
Once the inside of an Allen bolt is rounded, the truss-rod is unadjustable. It's also easy to round off an external hex with an 'it might just fit' tool. Been there, done it ! Make certain it's exactly right. –  Tim Jul 29 '14 at 12:05

Go down to your local hardware store and try various hex wrenches until you find the one that fits snugly. Then buy it there.

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