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Originally Posted by madmatt That just sounds scary... |
Scary? For the uninitiated, maybe. However, it is the way that it is done.
Think about this: Most of the work a tech does is on guitars. Most electric guitars are strung with either .009 or .010 gauge sets. There is no cross over between the sets. If individual files were made for each set of strings (they don't really exist from any one manufacturer) it would require the tech to purchase twelve files. They will need to purchase more files for acoustic guitars. Basses would be a nightmare.
The "wobble" that the Walter describes is called "rolling" the file by Dan Erlewine. Doesn't matter what it's called, the idea is to create a groove that is marginally larger than the gauge of the file. This is an important technique. A .040" file will cut a .040" slot if carefully held vertically. That's great, but when a .040" gauge string is placed in that slot it will tend to bind. An extra thou or two will prevent that. Fortunately it is pretty hard to cut a slot so exact by hand because we all tend to wobble a bit. So the slot tends to be just oversize when done.