Deployment setup in slow moving river environ

I set up this HydroMoth for a short term test run in a local slow moving river environment:

• 1 ft long piece of metal angle stock (approx 2 lbs)

• 6 inch piece of plumber's strap - to hold the HydroMoth to the angle stock

• 1 rivet - to hold one end of the plumbers strap

• 1 - 1/4" - 20 thumb screw - to hold the other end of the plumber's strap

• 1 - 1/4" -20 bolt - to hold the leash

• 1 - 5 ft long swaged nylon coated braided metal wire - to hold the whole thing to something solid

• 1 big fender washer to hold the leash against the angle stock

I drilled 3 holes in the angle stock: 1 for the rivet, 1 for the thumbscrew, 1 for the bolt. I tapped the thumbscrew and the bolt holes

I threaded the plumber's strap through the brackets on the back of the stock HydroMoth enclosure. Fixed one end to the angle stock with the rivet. I used the thumbscrew as a removable end to the plumber's strap to be able to remove the HydroMoth if needed.

I set it up so the open end of the angle stock would rest on the river bed and point the Moth slightly upwards.

I wrapped the leash around a tree root in the water, threading it through one of the swaged end creating a girth hitch. Then I used a 9/16" driver to secure the other end of the leash (with bolt and washer) to the angle stock.

I used my modified mag fob to trip the Moth and set it down in the river. I picked it back up 2 days later and WOW! are there some mysteries to unravel in that soundscape. There is a lot going on under quiet looking waters.

The whole setup took me 1 hour to figure out what I wanted to build and 30 minutes to drill, tap and finish. All parts from the junk drawer.