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I've used them for years. Newer ones aren't as reliable, unfortunately...crappy stuff made by Chinese slave children. Buy the most expensive one you can find. (20 bucks?) They're a clever low-tech solution, in my experience.
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degroff pistons ( brass/silver +engraved ) sell for
pennies on ebay, graphite dusts from what i have learned
from charlie webb, will bring them back to life.
a blood pressure hose + bulb cost pennies too.
it works with betax+studio shutters,
and will work with modern as well...
they are the best shutter releases money can buy
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