Deeper Sonar boat mount bracket extension

I purchased a boat mount from Deeper Sonar to go with the portable fish finder I bought from them. The boat mount inside, but is too short for the pontoon boats that we rent when fishing.

There are two parts to the extension: a bracket clamp and an extension rod. The Deeper Sonar mount has a flexible rod that attaches to the clamp using a 1/4 inch screw and attaches to the fish finder holder using an M5 screw. I created a 6 inch extension that uses an M5 screw and M5 nut or M5 insert. The insert is installed using a soldering iron to melt it into the rod.

The flexible rod screws into the clamp in line with the clamp screw. This makes the flexible rod parallel to the water, so it needs to be bent down toward the water. The clamp bracket allows the flexible rod to be attached on the top or bottom of the clamp, pointing toward (or away from) the water. The bracket is held on with a 1/4 inch screw inside a knob. The knob can be removed and the flexible rod inserted. The bracket has