I've used Z-bends in the past but have found better/easier ways. I use either a 90 bend with an E/Z link or a clevis to attach to the servo for most applications.You can use the wheel servo but I prefer the star shaped servo arms. Moving the the pushrod further or closer to the center of the servo will change the throw and also is more work for the servo the farther from the center you get. I've still rather inexperienced in this hobby so I'm sure someone can clarify or correct my information. HTH