Always worthwhile having a spare set of rigging or, at least, some trap lines and make sure you check the set in use every week. Swop out anything that looks suspect.

Other than that a storage bin with sundry shackles, blocks, bungy cord and lengths of Dyneema or equivalent should get you through most eventualities.

Don't forget the "Ace in the Pack" item for all cat sailors - a roll of good quality Duct Tape!