"If you need an eccentric crank, you're certainly on the right forum."
It's like you've known me for years.
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But seriously, folks - I'd try the epoxy fix first - well, second, after looking for a part on the InterWebs - epoxy is great stuff, but does require a bit of area to exhibit any bonding strength. Worth a try, though - what are you going to do - break it? That eccentric crank/rod actually does no work at all on this model - it just flops some (incomplete) valve gear around, so little strength is needed. A little silver/light gray paint will help hide the repair. If possible and visually acceptable, try to work a little piece of flat brass - or wire, even - into the repair equation to add strength - think permanent splint.
OR - in this case, as it is easily fixed again and not prone to being lost, try a little good CA/Super Glue (the splint here too, maybe) and see how long it lasts, before fiddling with the epoxy. So you have to fix it every 5 years... Gorilla Glue CA claims to have improved shear strength by retaining a smidge of flex. Dunno - I do use it, though.