Why are there no camera technicians in the DFW area that can CLA an F or F2? Slow speeds way slow. I took a lens from an Isolette to a mechanic in a Garland because I could not get the cells apart. The green goo. He applied pliers, crushed the lenses, said "I'm sorry". Don't bring him up. Steve Serota and Pete Smith both died with my unrepaired Nikons in their respective shops. Nikon in El Segundo put the F3 back on-line.