Can you post a pic of the metal? I know there's an aluminum insert inside the light, it's probably 2" x 3" ish... curved.
These links show what the knee lever looks like in its entirety:
http://oldsingersewingmachineblog.co...lid-of-a-201k/
http://oldsingersewingmachineblog.co...nee-lever-201/
I also learned last week that a 99 will not fit in a 128 case.
The base of a 128 (or at least the one I have) is too shallow, so the machine can't seat if the hinges are used, and there's no suspension room to keep the 99 mechanism off the base.