In replacing a light, I have these dandy wires in the ceiling box that look like they've been twisted one too many times. The birds nest up in the box is all secure, but the two I need to connect to have totally lost part of their insulation. There is not enough wire length left to cut and strip a new piece. Is there a safe way to do this without paying an electrician to fish new wire? Is plain electrical tape ok or is there another product...maybe a heat shrink tubing I'm not aware of that can be used for house voltage? Thanks!