Assembly Instructions for the O₃ Cobra Bag

The instructions below will help you with the correct assembly of the O₃ Cobra Bag Kit for optimum performance.

Step 1: Attach the Base Connector to the OctaBase

The first step is to attach the Base Connector to the OctaBase. You will find a bag of 8 long black screws. You have two options:

1. Upright with the arches of the OctaBase facing down  - this will give you roughly an extra 5 inches of height. In most cases this is the ideal way to set up your base; or
2. Upside down with the arches of the OctaBase facing up - this will reduce the height, but the cavity will cup the sandbags a little better. This is better if you want a shorter cobra bag.

I recommend setting it up with the OctaBase in the upright position and use the height adjustment to lower the cobra bag to your needs. If your lowest setting is still not low enough, then you can try reconnecting with the OctaBase in the upside down position.

Step 2: Insert the Mast & Tighten The Steel Clamp

Place the OctaBase on the floor and insert the Mast into the Base Connector while pressing both of the push button. Push it all the way in and twist until the buttons pop out through the holes in the Connector.

Once the buttons pop out through the holes in the Connector and the Mast is firmly in place, place the steel clamp over the collar and tighten it. Make sure to tighten it as much as you can, but only by hand. Check that the Mast is nice and rigid. From time to time check the clamp around the collar to make sure it is tight. The rigidity of the Mast will have an impact on the performance of your cobra bag.

Step 3: Insert the Click Bar into the Mast

Insert one end of the Click Bar into the top of the Mast while pressing on the two buttons on the Click Bar. Slide it down until the buttons pop out through a pair of adjacent holes in the Mast. By selecting holes at different heights gives you height adjustment.

Step 4: Mount the KS3 Spring onto the Click Bar

Press in the two buttons at the top of the Click Bar and mount the KS3 Spring onto it. Slide the Spring onto Bar until the buttons pop out through a pair of adjacent holes in the red Spring connector.

There are two sets of holes, allowing you a further fine adjustment of height.

Step 5: Insert the Click Bar or Red Bar into the Top of the KS3 Spring

The KS3 Kits come with two Click Bars, the second one for the top section of the cobra bag. For increased speed you can use the Red Bar, which is about 3 inches shorter and slightly lighter.

Swapping from using the Click Bar in the top section to the Red Bar can offer you greater variety in your reflex training.

Step 6: Assemble the Ball & Ball Adapter

Open the Velcro strap at the opening of the ball and unzip the opening all the way, revealing the bladder and the protective tongue. The tongue is there to reinforce the zip. The tongue is designed to lay flat between the diaphragm of the adapter and the zip, so pull the tongue out as you insert the adapter. Make sure that the bladder is sitting inside the diaphragm of the adapter and thet the tongue is on the outside, just under the zip.

Note, that it is quite a tight fit, so you will need to push in the outer edge of the Adapter diaphragm with your thumb, while slowly working your way around until the whole diaphragm is in.

Once it's all in, adjust it so the tongue is on the outside of the diaphragm and then pull the zip all the way down as far as it will go. Cover the puller with the Velcro strap.

Using a ball pump (not provided) with a wet needle, inflate the ball to about half way and feel around by squeezing the ball to make sure that the bladder is where it should be in the center and not caught on the edge of the diaphragm. Do not twist the adapter as it may twist the bladder inside. Once you're satisfied that nothing is caught or twisted, inflate the ball fully until it is nice and firm. It should be firm, but not rock hard - it's important not to overinflate it.

Top Tip: wrap 3 or 4 rounds of wide cloth tape around the zip area to protect the zip from splitting open during training. The more tape you wrap, the heavier the ball will be, so if you're looking to increase the weight of the ball, just wrap more tape around the base of the ball.

You can now mount the adapter with the ball on it onto the top section of your cobra bag. The Adapter has a number of hole pairs in the stem for adjusting the reach of your bag. There are also two hole pairs at the top end of the KS3 Spring just like at the bottom for fine adjustment of the reach length.

Step 7: Fill your Sandbags to Weigh Down Your Cobra Bag

The cobra bag will perform best if the base is properly weighed down. I have designed each sandbag to weigh roughly 45 pounds (20kg) when filled with sand. I strongly recommend lining the inside of each sandbag with a large, heavy duty bin liner bag to prevent the sand from seeping through the stitched seams.

As you fill the bags with sand, push the sand out to the far corners and try to make sure you fill the bags all the way to the top. Once the bags are filled to the very top and are slightly bulgy, tie off the liner bags loosely and close the Velcro shutters.

Place one bag onto one side of the OctaBase against the Mast and Velcro the handle traps around the Mast. This will prevent the bag from sliding off during training. Do the same with the other bag on the opposite side.

Top Tip: more weight is always better. Increasing the weight adds to performance. One way to increase weight is to  add a second set of sandbags on top of the first. You could also use wet sand to make each bag about 20% heavier. The combined weight should be at least 90-100 pounds for solid performance.

Optimum Tip: Using Olympic weight plates on top of the sandbags is another great way to increase not only weight, but also the rigidity of the Mast. For this I have designed a special Olympic Sleeve that comes with this kit and can slide onto the Mast and hold a weight plate or two firmly in place. One or even two weight plates can greatly enhance the performance of your cobra bag because they brace the Mast at a much higher point.

Make sure to check out my YouTube channel for more tips and ideas, as well as training videos and latest add-ons. I hope you enjoy the Kewlus cobra bag, and if you have any questions, you can ask Tim (bottom right) or use the Contact Page to get in touch with me.