Shorten a curve by a specified amount

I'm looking for an easy way to chop a specified amount off a curve or an arc - specifically shorten the length of the line by a given amount rather than shortening by the length of the cord of the arc; sometimes the curve is not an arc which makes the calculation rather complex.
Another way of saying it might, for example, be "I have a wiggly line that I need to cut 3mm off the end of".

Download, unzip and open the following Illustrator file (AI 10 format, ca. 30 kb).
Shorten Paths
In that file there are 21 graphic styles based on Pattern brushes. Now:
1. Select the path
2. Copy and Paste in front
3. Apply one of the graphic styles
4. Object > Expand Appearance (do not deselect)
5. View > Guides > Make Guides
6. While smart guides are enabled, zoom in, get the Scissors tool and cut according to the guides you created at point 5.
Note that this method is not 100 % accurate and on some/many paths you'll need to modify the pattern brush in order to get more accurate results (for example, see graphic style 'exceptions')
If you need other lenghts, then you would have to create your own graphic styles.

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