The easiest way that I have found to load a new refill is to, take the black or masking tape off of the new one and unwind about two feet or so of it, then put it back in the small tight fitting ziplock bag it came in or put it in your shirt pocket with the end sticking out. Dont lose control of it, should still be the way it came except for the two feet sticking out of your pocket.
Pull the rest of the old filler off, put your finger inside and hold tension on the spool,carb screw driver will loosen the screw holding the end of the tape. Remove old filler, stick on new end then with one hand over shirt pocket (so tape doesnt escape) slowly release the tape spool. It will not wind all of the way and you will have to rewind the tension.
I like the black tape on the last 5 or 6 in. too. That is where most of the wear is.
Also, just loosen the screw that holds the end of the filler, dont take it out.