Many of the new fiber optic sights available have excessive amounts of fiber wrapped around teh sight.....in many cases, several feet. The sight that started it all, the Impact Cosmic Eclipse, is still one of the brightest around though several other companies have caught on to its success. Speaking of which, the Cobra Sidewinder might suit your needs. Plenty of fiber optic cable for a bright pin with a small diameter head. I would start your search there.