OK, well I used the sponge and Silicone like I seen on YOU TUBE. Well it didn't work for me. So, one of my questions is....When I push the transducer down in the sponge/silicone, do I need to push it all the way until it touches the yak?? Second question is, Does the transducer have to be on a flat surface?? I'm putting it in the middle of my yak and it's not completely flat. Do I NEED to use the sponge?? Hopefully I worded everything good enough to understand, Thank you for any help!!