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Join Date: Aug 2010
Location: Madison, WI
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Bikes: 1961 Ideor, 1966 Perfekt 3 Speed AB Hub, 1994 Bridgestone MB-6, 2006 Airnimal Joey, 2009 Thorn Sherpa, 2013 Thorn Nomad MkII, 2015 VO Pass Hunter, 2017 Lynskey Backroad, 2017 Raleigh Gran Prix, 1980s Bianchi Mixte on a trainer. Others are now gone.
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If that is the sensor on a chest strap and you only have three screws holding it on, it might be easier for sweat to get into it. You might consider putting some electrical tape over the backside where your skin contacts it to seal it.
If it is a screw that goes into plastic, a lot of watches like Casio for example use small screws. A watch section in a store might be able to help if that store replaces watch batteries. They might just give you a screw if they have any spares.