We have threads for finding sources for magnets, and for balljoints. Now comes the turn of springs. This subject comes up because I've just been fixing my Universe Heavy Load to open without his Cyber Key, and somehow, while working on him, I appear to have lost one or two of the little springs which were inside (most notably the one which returns the missile trigger to its original position). But it's not the first time I've wanted a new spring; I've had occasions when I've fancied designing a new missile launchers but would need a spring to power it, and those things do get lost very easily. Does anybody know of good sources of various sizes of springs?