Good Evening Folks

So I've made a smart component.  It's a hinge and the only smart bit is that it cuts the housings.  Great, it works fine.. but then I come to apply the smart features on the second hinge and it's not an option.  When I go to the menu the option is grayed out.

Really Solidworks!  Do they only work the once?

Maybe it's because my smart components are in an assembly, but how else?

Thanks for looking..  Any ideas anyone?