Hows it going?! Great here! Dr. Clark doesn't actually endorse any zapper,(go to http://www.drclark.net) though the Zapper her son and her designed was similure to Don Croft's. Most Zapper makers use the origonal curcitry design, but all of them vary on style and features. They all work, so choose one that fits with you.
I use the ZP Zapper (http://www.zapperplans.com) and love it. It fits me. :) It's kind of cool looking, so a lot of my friends have tried it. Also, ZP now recommends some copper "rings" for your fingures, which I have been using and they work wonderful! I play the piano and type on the computer while I Zap now! :) Can't quite wash the dishes, but I guess we can't have everything! (btw, they will send the rings with the Zapper at your request.) Anyway, I hope you find one that fits you great!