My LnL came with an extra case retaining spring, and I e-mailed Hornady and requested some spare primer slide springs. They sent me three. They are so small that my fumble fingers are sure to sent one across the garage when I change primer sizes. Don't really know what else you would need. But then I try to stay enough ahead to not have to reload but every couple of weeks.
Education teaches you the rules, experience teaches you the exceptions (Plagiarized from Claude Clay)