TechnoTed: What is it you are looking for; girth or length? I know there are guys out there claiming both with jelqing, but it is primarily for girth. The claims for gain by jelqing are dubious at best and may even be true that 'jelqing' is a hoax created by a couple of practical jokers! :' There is video showing the Power Jelq. If you haven't seen it, it might be on the Power Jelq USA website. If you can't find it, let us know on this forum and one of us will look it up for you. When you study the video, I think you will think twice about buying this contraption.
I would suggest you use squeezes to gain girth and/or a mushroomed cockhead and stretches for length. If you have about $100 you can get a Newart Extender (a mechanical cockstretcher) which will probably give you the fastest gain in length as well as the easiest gain. <www.newart.com> I made mine from studying their pictures from 2" ABS plastic and 1.5" ABS for the slide. For the 'lasso' I threaded a cord thru surgical tubing. The extender is very comfortable and I use it daily for an hour or so (with breaks about each 30 minutes or so). When stretching my cock, I am currently maintaining 20 lbs. of tension. Although my cock is a satisfactory 7.5" x 6.2" (7" flaccid) with a large, nice corona, my goal is a nice even 8" for no other reason than the ego of us guys... :

My wife likes it as it is and has mentioned "ya don't need it any bigger

but I like the feel of substantial, heavy meat when holding it in my hand and feeling it swing back and forth as I walk around in the buff and the look of it in the mirror.
The ultimate for both would be the Erecaid Esteem Vacuum System by Osbon which is what I used for years for my growth but it is about $500 or so unless your insurance covers ED.