Can I wrap some kind of tape around the end of my tapers so they stretch a little at a time?

I have electrical tape (the black kind), but I'm not sure it's safe to use. I'm actually not sure if it's okay to use tape on these at all. I'm at a 6g right now. I know when you get to bigger sizes you can wrap some kind of tape around the plugs you use in order to stretch it kind of slowly. Is there any way to do this with the smaller tapers? I use acrylic (I know, it's not the best choice, but I haven't had any problems with it so far). My last stretch, from the 8s to the 6s, hurt quite a bit more than the other stretches, probably because there's more of a stretch than from 14 to 12 to 10 and so on. I had waited a month and they were a little difficult to put in but once I got it, there wasn't much of a problem. It just ached a lot and I had a hard time sleeping, which I'm trying to avoid with my next few stretches (I'm going up to either 2 or 0 or 00, not sure yet). So basically I want to know if it is safe for me to put tape on the ends of my tapers? Or if there is any other safe way to gradually stretch at this size?