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My hiking shoes starting having problems with the insoles, so I got replacements. However the replacements I have are "Trim to fit."

How do I get the proper shape so that I don't end up with any misaligned or rough edges?

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up vote 4 down vote accepted

The only technique I use is to take out the old ones, draw round them with a sharpie and then cut out to the inside of that line.

This works very well, and trimming to make sure the line is just removed gives an accurate measure.

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