Originally Posted by
ksisler
Well that maybe correct...but I will admit that I have never see a bike this way nor the way the OP shows it. In memory of thousands of bikes, they are the otherway... just a finger knob on the outside and just a little bump or something on the inside to retain the spring. Google Images search for "dropout axle adjustment screws" provides so many variations, it made my head hurt.
/K
The finger knob on the outside is the separate knurled nut that the OPs bike is missing. And the little bump retaining the spring on the inside is the head of the screw. If you clean off the dirt you'll even see the slot. So it's not that you're seeing anything different, or that your memory is failing, it's just that you never looked very closely.