Lol, that's what's missing from my spare. I do have a lens, but it's got some scruffs I have been unable to sand out of it. You can have it if you want. I can take pictures if you like.
Bummer! Shoot me a pic if you don't mind. It might be better than what I have. I glued some eye lids on mine awhile back and the glue ate into the lens, now it looks pretty nasty!
I've got one that's intact except adjuster is a bit messed up, works, but hard to adjust. Lens is fine. Call it $40 picked up in S. Mpls. email to mark (at) entropyrally (DoTCom) because I'm only on here once in a blue moon these days.