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A friend of mine used a cheap (HF) auto-darkening hood for a fairly intensive day of welding.
Next day he had spots in his vision and discomfort.
What he learned was that cheap hoods do not respond quick enough and allow a few milliseconds of UV exposure before going full dark.
The hood went straight in the trash and (happily) his vision recovered.
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86 911 Race Car, with a few 993 bits in the boiler room
79 928 Race Car
88 928 Becoming a Race Car
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