After sometimes struggling stowing my fully battened main, I wished I had specified in mast reefing, the following made life much easier:
Fit small round PVC discs at the leech end of the sail, directly opposite the mast shackle where the sail folds. When the sail is lowered, all you have to do is align the discs over the centre of the boom, knowing that this will fold the sail neatly and quickly.
The discs were fitted by a local sail maker during winter storage for just a few pounds, and while he was about it I asked him to replace those horrible plastic shackles with reinforced webbing sewn to the slides. This all makes for a much easier and neater stowed sail.
Barry Powling, Khamsin {Brittany France}