I've would like to install a tow eye on the transom above the swim platform. Is there anything special I need to do for drilling through the gelcoat/fiberglass? Also should I worry about water being able to seep into any small, unnoticable gaps even if it looks like the eye is flush against the transom? Last question is what is the recommended backing material and size? The backing will be in a small storage area in the transom and out of view. Thanks.<br />Travis