this idea comes to my mind when at one time repairing a euro mortise lock (sort of Cisa brand) disassembling it, and suddenly the spring comes flying out that took me 20 minutes, looking for the spring, where it flown. so i made this thing to secure the portion of the lever handle bar guard, and keep it in place while diaassembling the lock. see the video, you might find it also useful for you.