DSI shoot through hull

Keep the mirage flippers out of the transducer cone.

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If you look closely at the picture, you can see that the foam is angled inside, so it's wide at the base where it touches the hull, that's so the foam doesn't interefere with the signal.  It's tight at the top, so it doesn't pop out or lose water.  So tight, that it squirts a stream when you insert the 'ducer.

Awesome, thanks!