Got a reply from Garmin:
Dear Dennis Norman,
Thank you for contacting Garmin Europe.
Garmin are aware of these reports, however this has now been addressed.
In early versions of the Transducer, the hardware did exhibit corrosion issues after little use. Garmin have been investigating the reasons for this and have now provided new mounting hardware for use with our Transducers will be more suitable for use with the Transducer.
If you are able to provide the details below, I will be happy to send replacement mounting hardware to you.
Name:
Tel:
Shipping address:
If you experience any other problems in the future, please come back to me.
If there is anything else I can help you with then please let me know. Alternatively you can search for a solution here:
http://www.garmin.co.uk/supportKind regards,
Alex
Garmin Europe
New Nuts on their way