Originally Posted by BogMonster
Just another thought ... would the silicone sealant method work with this transducer if I tried that? i.e. stick it onto the hull outside the bath and if it works I can leave it there, if it doesn't I can get it off again without too much bother.
The removable qualities of silicone are handy, but it is prone to air bubbles. Certainly an way to suck it and see.
As for finding the right spot, aside from blutak you can also use something oily.