I didn't want to start this thread yet because I won't actually start on the costume for a couple more months, but I'm starting work on the hidden blade following some youtube tutorials I found. It's easy enough to make, but I want to be able to wear it to cons and whatnot. I'm thinking I'll make the blade part from a rubber stunt blade or a piece of blunt plastic, nothing that could actually stab or cut, and it won't have a locking mechanism, so contact will just push it back in. So my question is, is a switchblade or spring-loaded mechanism like that legal (in CA particularly) as long as there isn't a blade attached to it? I know CA law states that a switchblade blade can't be longer than 2", but I can't find any info on whether the mechanism itself is illegal if the "blade" that's attached is nonlethal. Any help would be appreciated.