Preparing an ejection charge unit is fairly easy. To complete the task you will need:

• 1 Centrifuge Vial (Supplied in the kit)
• 1 Grain of Wheat Bulb (Supplied in the kit)
• A drill with a 2.5 mm bit
• A digital Multimeter
• A Diamoind Lap File. (You can get these from Bunnings for around $20-)
• A hot glue gun with glue.
• The required quantity of Black Powder

First off, check the resistance of the Grain of wheat bulb using the Multimeter.. The standard 3 volt Grain of wheats that we supply in kits should read between 6 and 9 Ohms.

Use the Diamond file to carefully grind the top off the bulb. We want to keep most of the bulb intact, just remove the domed bit at the end. We do not want to damage the globes filament. As you are cutting glass take the usual precautions for doing this.

Glass dust is not good to breath in so use a mask.

• Beware of loose bits of glass during the grinding process and definately use eye protection.
• Glass is sharp when cut, consider using gloves.
• Beware of bystanders/pets
• Use some common sense  

Check the resistance again to make sure that the filament has not been damaged.. A low, zero reading means that the filament has been damaged. A high reading means that the filament has been shorted by the filament arms. In either case, throw it away and start again.

Open the Vial and use the drill to cut a 2.5mm hole through the end of the vial.

Thread the globe leads through the vial but leave the globe out of the vial at this stage.

Put a dob of hot glue on the base of the globe, then pull the globe leads so that the globe seats in the bottom of the vial before the glue sets.

Fill the vial with the required amount of black powder and close the lid of the vial.

Job done, check the resistance again to make sure that the globe is OK, and you should be set to go.

3 Volt grain of wheat globes should only be used in ejection systems that can handle low current ignitors. The continuity test of higher power ones could be enough to set these ones off so be warned.

Some electronic systems do not control the state of the ejection charge circuitry when they are first powered up. Ejection charges should be isolated from the electronic unit by an external switch while the electronic unit is being powered up.