Hello, first of all, sorry for my english, I speak it in a very basic form. A couple of months I bought some flatwounds (Pyramid, Thomastik and Optima RB). These are round core, so my doubt is how to string them? I recently string a Sunbeams set, and in the packaging it said that the round core needs and "edge" to grip it, in order to do so, i needed to "crimp" the string. This same principle is applicable to the round core flats listed? Thanks, and stay safe.