I use the "wire zipper" which is very similar to the one listed above. http://www.thewirezipper.com/ The nice thing about it is you can manually apply pressure and get a "feel" for when you are cutting through insulation vs. the strands. After a while, you can get very good at adjusting the amount of pressure from the cutting wheel so that you only score the insulation, nothing else. Now, no wire is safe from me, including stranded.
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