I'll utter my old song and dance about Z-bends: we don't use 'em on full size aircraft and I'm not about to use them on my models (with the exception of something like a foamy). About the only good thing I can say about them is "they're simple & cheap". Other than that, they're pretty agricultural and crude IMO; sloppy, hard to deal with if you need to adjust the linkage, and did I mention crude?. Clevis, ball link or combinations thereof for my stuff depending on application.