I needed some sort of secure harness – to hold the Petrol Soundbag.
A good place to start looking >
Then click on the “Images” tab. Lots of designs to consider…
Versa-flex have a few models. Price range: $154.95 to $225.45
LocationSound have a good selection. Price range: $75.25 to $399.00
Happened to find this Smith Backpack on Amazon. Price: $31.34
Here’s the original design of their ‘backpack’ system >
Its intended use – is to attach a plastic tank (to hold ~4 gallons) on the backside, with the 4 sewn-in straps. You then fill the tank with chemicals (to perhaps kill weeds), put the harness on and walk around – holding a spray nozzle in one hand. It’s attached to a rubber hose – which goes to the bottom of the tank.
The other hand operates the pumping handle – which builds up pressure inside the tank. When you pull the nozzle trigger, the spray comes out…
I thought this harness had great potential and the price was unbeatable…!
One just had to move the function of holding something – from the backside to the front.
Ordered it thru Amazon and got in Jan-2018…
So, it just sat there – waiting. I would occasionally put it on and try to figure out the best way to attach the soundbag. After a few tests, I concluded that the soundbag first needed to have a rigid internal frame built. See the previous Petrol Bag posting.
Finally, in early May-2019, with a vision of the new design, I purchased all the necessary hardware, from a store in Calgary >
All the original straps on this harness, were in the wrong positions – for the new design.
Used a ‘carpet-knife’ blade – to perform the delicate operation of cutting between the sewn-on strap and the vest. One starts at a corner of a strap, slowly pulling and peeling it away from the vest, as more threads are exposed and cut.
After the strap is off, a fine-tipped needle-nose pliers, is used to pull out all the remaining threads in the vest.
Here’s a shot of all the straps – that were removed >
After figuring out the best place to position the waist strap, I proceeded to make holes for the rivets. This next image shows the most important tool, for this project >
A common 1.5 inch roofing nail – probably used to hold down asphalt shingles. It has the perfect working length and it needs to be tightly held and locked with vise-grips. It also has the perfect diameter for making the holes – that the rivets will fit thru.
This next step is key. The nail is placed over an open flame, until it is red-hot. With one hand firmly holding the nylon strapping in place on the vest, one quickly makes two holes – going thru all the layers at once.
You need a good aim, judgement of distance spacing and a quick delivery. It would be very easy to screw things up. A red-hot nail doesn’t care – it will do its melting job, no matter where you place it… 🙂
If you wreck the vest, you could just buy another one for $31.34… 🙂
Rivets are then inserted from the inside of the vest and then out – thru the new strapping.
With the narrow end of the rivet sticking out, one pushes a cap on, with finger pressure. Then with a heavy steel backing plate, a hammer is used to join (compress) the two pieces together.
The nail is put back into the flame, to be reheated – for making the next set of two holes. This melting action – cauterizes all the nylon, meshing and foam materials. There are no loose ends to worry about.
Just keep the door open for ventilation… 🙂
Here’s a close-up of one side, of the waist hooking assembly…
The D-ring attaches very quickly into the spring-hook. And it can’t come apart by ‘accident’ either. The other end of the waist strap has a clamping-buckle on it, which allows for perfect tension adjustment.
After the waist hooking system was completed, marks were made – where the other 4 straps would go – that would eventually hold the soundbag in place. Each of these straps also have a clamping-buckle for tension control.
The soundbag came with 4 D-rings sewn into the bottom corners, and 4 more are on top.
This next image – is the Beauty Shot. It shows the completed positioning of the 4 spring-hooks, that go to the bag. Each of these straps have about a 5-6 inch range of movement – depending whether one is wearing a tshirt or a heavy winter parka. The bottom waist strap also has a ‘tail’. Just pull each one – to tighten things up…
All together, I used 24 rivets for this harness and the total weight is just under 2 lbs.
And here is the Work Shot. Used whatever was at hand – to quickly help hold down, or push various areas of the vest/straps, into position. This combined effort helped produce the above image… 🙂
Next to come – some action shots of the vest + soundbag + the Zoom F8 audio recorder – connected to the Rode NTG-3 shotgun mic, which is on the boom-pole…
Ordered a Triton Audio Fethead Phantom from B&H Photo. Tracking number indicates arrival on Jun-11-2019.