I don't own an actual Lightning Bug* but I do have a very nice clone made by Lionel (yes, the model train company) as the military "J-36" during the Second World War, and so, for scale purposes, here they are lined up with my Begali Intrepid:The Lionel was my first commercially-made semiautomatic key and has a little lump of bar solder added to the weight to slow it down.
The Zephyr arrived partially disassembled, lever freed from the pivots and fingerpieces removed, with each subassembly carefully bubblewrapped. This is an excellent way to ship a key, if the person taking it apart knows what he is doing. The guy I bought it from did, and the fragile fingerpieces and the easy-to-deform steel reed that is the heart of the key all arrived intact, Reassembly took a few minutes and I was once again glad to own an inexpensive multi-tip gunsmith's screwdriver set. I have roughly adjusted it and it runs nicely, though fairly fast.
UPDATE: If you look at the large version of the photo above, you may notice something that sent me scurrying to my basement hamshack this morning: I had not installed the "paddle" portion of the fingerpiece properly! It and the lever are tapped and there's a trick to snug assembly. I had not used it and as a result, the paddle was under some stress. All better now. Whew!
A bug key that shows up a bit more frequently than the Zephr is Vibroplex's Champion, with the same parts but on a full-sized base. (Or it's a Lightning Bug with a Zephyr-style damper, if you'd rather). The Champion generally sells for less than the other LaHiff-type bugs but it's a perfectly good key._____________________
*I was a little surprised to realize that.