Re: Damaged Fly Line?
If I may add something to what Bear has mentioned, If you do remove the 'Loop' and add the 'Butt Section' of 30# mono, you should seal the freshly cut end of the fly line with a tiny drop of Super Glue to keep the line from wicking water and therefor sinking.
Looks like Riptide posted the same info a fraction quicker than I. lol
*Comments posted above are only my opinion. I may be right....ehhh.....I'm probably wrong. Take 'em for what they're worth.*