Here is the trick that will solve all your Skimmer transducer problems, if you choose to use them instead of a Ice Ducer..
Buy 5 feet of PVC pipe and 1-T. Cut two 12 inch piece and slide them in each side of the T and then add 3 feet of PVC pipe out the bottom and drill a hole in the bottom of the PVC and run the bolt from your transducer thru it tigten the nut slightly on the other side "Wahla" ready made transducer stand. Then all you have to do when you get to the lake is mess with the transducer moving it slightly back and forth till you get it parallel in the hole- Yes it needs to be straight up and down or it wont mark properly- That is what most guys problems are using skimmer transducers on hard water..
I have built two of the set- ups and they work slick!!! And when you are done fishing for the day you can pull all the pieces apart and put them in a small bag or whatever so they dont take up so much room and head home!!
Cost: $5.00 at the most..
Happy fishing!!!