For all the nay sayers have a look at the Sideshift web site and the unit can be seen on U-tube as well. I was a little skeptical I must admit but another fellow in our marina installed one two years ago and he is meticulous with his boats and says he absolutely loves it. I will let you know, easy to remove if I have to since there are no holes below the water line but I have a feeling that won't be necessary. Makes the first mate a lot more comfortable when docking.
https://www.sideshift.com/shop/