Bubye, I've been searching for the article ever since you posted the wish and finally found it. Seems that I was completely off on some of the info, but the fixture is still a good idea.
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Custom Combat Handguns, Vol 7 No. 1 (a very good issue)
Karl Sokol's Home Defense Revolver by Ralph Mroz:
"Last, and most important, Karl installed a Sure-Fire flashlight on the gun. SureFire lights are the standard by which all tactical lights are measured, and they consistently set new standards in this tactical area. I have one mounted on my shotgun and rifles, my duty pistol, I carry an additional one while on duty, and my wife and I carry one as an ever-present companion to our concealed firearm. Since Laser Products, the manufacturer of Sure-Fire lights, doesn't make a mount for revolvers (although they seem to make one for every conceivable pistol, shotgun, subgun and tactical long gun), Karl had to get inventive. An over-the-top position on a scope mount would have been the easy thing to do, but he nixed that simple approach because the scope mount and light would have obscuredd teh sights in most home-defense situations where a Stressfire-type sighting index is likely to be used. Karl considered other solutions: a Weaver rail screwed into the right side of the barrel with the light mounted on it, or a simple clamp affixing the light nonpermanently to the underside of the barrel. Both of these approaches, however, would habve exposed the light to the violent gases escaping from the forcing cone/cylinder gap, and made the gun quite muzzle heavy. Karl settled on an innovative but simple solution. He mounted a small length of Weaver rail to the bottom of the grip frame, and attached the 6P to it with a Weaver ring. This elegant solution accomplishes several important things. First, the light is securely mounted to the gun. Second, the gun is now balanced properly, and it points naturally. Third, the light is not susceptible to damage from any "exhaust gases". The switch is attached by hook-and-loop to the left side of the grip, where, with a normal "searching" or "ready" grip, the light remains off."
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The link you provided showed the light suspened under the barrel and it didn't look too solid. A one-inch section of weaver rail couldn't be that expensive and the ring could be of any size for whatever flashlight you might like.
The photos (sorry, I don't have a scanner) with the article show the S&W M65 to be well-balanced by the setup and I definitely plan on one for my revolver, when she comes.
Hope this helps.