Having recently knocked a transducer off of my trolling motor, I decided to quit being lazy and to come up with a way to protect the transducer so hopefully it doesn’t get knocked off again. Yes there are a lot of versions out on the market but they are more than I wanted to spend. So I have about a 3$ solution. I took a 4” angle bracket then, I bent the bracket to the desired angle. Once I had the angle right I cut each side to the desired length with a hacksaw and then I used a grinder and file to round off and smooth the cut sides. Sprayed on some Rustoleum paint I had lying around and fastened it on with a band clamp. Total investment a little time and about 3$ since I had the paint.
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I went to Lowes and looked at the "L" like you used but purchased a piece of flat steel for $4.++ and make about 6 of them 
Gread idea and yet so simple. I looked on line at the guards start a $20 and up not a simple as easy to do. Good job 
I may event let you have a touch of "Too Slows" magic starting fluid in the boat room cooler 
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