Larry's Whiggley's use brass wire looped from the front eye around a tube that the eyes glue into. If you just want a screw lock, Owner makes them. I think Owner calls them Twist Locks. I remember seeing them in Bass Pro Shops Master Catalog a month ago. I'm sure you could find them ... after a quick search ... here you go ...
http://www.basspro.com/Owner-TwistLock- ... 744/128028The brass as Larry demonstrates is much better but these also work.
Mike