Yes, I know all about 'inheritance issues' of wrong sized line... and fuel hoses... and anchor chain rode... We've been working at replacing everything as we can from the most critical on down, and this is why I posted the question.
1. Halyards. The owner replaced the halyards a short while ago and they seem to be ok but wouldn't have been my choice. I would guess they are 11mm or 12mm, cheap braid.
2. Mainsheet. This is likely 14 or 16mm old braid... even though it's got a 5:1 purchase, there is so much left over tail that it gets in the way. It will be replaced if I can find a good deal on a fiddle block setup to replace the elderly 3x2 setup that I have now.
3. Jib/Genoa sheets. 13 or 14mm braid. I feel secure with these in rough weather, but I think they are really heavy and quite a bit bigger than those I have raced with on larger boats. I want to buy stronger, lighter lines. Also, the previous owner built these lines as a single line with a snap shackle spliced into the centre of it. When they get replaced, I will go with two lines... jury is still out on the shackle.
4. Reefing lines. I think these are 13 or 14mm as well. These are totally the incorrect lines and bind in the sheaves on the boom. I think I'll get rid of the 1st reef line as we always go straight to the 2nd reef. You think 8mm is sufficient?
5. Outhaul. Same as reefing lines, 13 or 14mm. It's only a 1:1 system, do you think more purchase is necessary?
8. Roller furling. This is a small diameter braid line and is the correct size and good condition... I'd have to measure it for the size but I'd guess 8mm max.
9. Topping lift. This old, cruddy line needs to go. I have 2 different thoughts;
a) if I use this as a spare halyard, that means it's sitting in the weather and deteriorating; When I need to count on it, it might fail.
b) if I use an older line, and keep my spare halyard stored safely, then I could always fish the spare halyard using the topping lift if need be.
I currently have 3 halyards and the cruddy topping lift on the mast now, plus two previous halyards in a locker. I think I will use one of the previous halyards as a topping lift, move my main halyard to spare duty in the locker and buy a new main halyard.
10. Traveller controls. I just replaced my aluminium track, pin stops and car with a fantastic new Harken setup I built myself - I can't tell you how happy this improvement has made me; a warm glow sets in when I touch it. I configured it with 3:1 control lines, but consider backing that off to 2:1. The cord is ... 8mm? I can't remember the trade name for the line, but it is super strong, flexible, soft and easy on the hands.
11. Docking lines. I don't have a permanent place to dock her yet, but I built my dock lines out of 13mm, 3-strand, nylon. I have 4x26' and 1x80' ... I think I'll add some boat handling lines in braid as the 3-strand gets grungy and hard on the hands after only 1 season.
No 6/7/12/13/14 for me yet.