Thank you!
I was wrong, the recipe allows me to remove only the limb protections to obtain heavy tread, but not Kevlar strips.

@Thekyle: Yea, but need to add the itens from this mod to the kevlar list. I can add this in the mod, in the weekend I will had time to do this.

I found the recipe in the crafting (only on vanilla equipment). Would it be possible to do it with the equipment from the "Vanilla gear expanded" mod?

It doesn't work for me, I don't have the option like with other clothes. I think the problem comes from another mod (armor weight or vanilla gear expended or both). Already seen this problem? Sorry I just saw that I'm not on the sewing machine mod page :)

@Thekyle: You need to tear apart others armors.

Good job! very usefull!
Where do you find "Kevlar strips" to repair armor?