Shortening the Tubes
You can shorten either or both the horizontal and vertical tubes of the gunnel mount if you want the assembly to take up less room on the vessel. This is an optional procedure.
When shortening the tubes, you must use a cutting tool designed for cutting metal, and you must secure the tubes using a clamp or other fixture designed for securely holding metal pieces while cutting. You must always wear safety goggles, ear protection, a dust mask, and any other clothing appropriate for cutting metal. Failure to use the correct tool or fixture, or not wearing the appropriate protective clothing when cutting metal can result in severe injury and possibly death.