Design Update
The original cleanout plug that was used for this project has a plastic threaded shaft. I chose that product because there were no metal parts to rust. As it turns out the plastic shaft is just not rigid enough for this type of device.
I found another plug at Home Depot that is mostly hard plastic but has a metal shaft. The rubber gasket from the first plug is far superior to the one with the metal shaft so in the latest version of this mod, I married the best parts of both. The result is a very sturdy cup holder mount that can be used for many applications. I have recently made a fly rod holder that mounts to this device. Other things are in the works.
Until next time.
Bob
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