Remove the plastic coating

Using a knife, and holding the wired flashbulb carefully, remove the plastic coating only around the center area of the bulb. It is not important to remove all the plastic coating, just enough so the bulb will shatter and allow the flash to ignite the powder. I know some people who just score the plastic coating around the periphery of the bulb, but I like to be more thorough. Some people have written to tell me removing the plastic isn't necessary, although it has become a habitual part of making my ejection charges. You may skip this step if you want, but the decision is up to you.

Insert into a tube

Insert the wired flashbulb head first into a tube. Be careful inserting it.

If it gets snug, use your needle nose pliers to insure the force is being applied to the bulb and not the wire leads.

All the way in

You should end up with your wire leads just inside the tube opening, as indicated in the photo.

Now, fire up your hot glue gun, and let it get good and hot! I mean let it cook a while. You want your glue to be nice and runny.

Then fill in the end around the leads with the hot glue and let dry.

Resulting seal

This is what it should look like.

Now, if you want to make up a bunch more like this one, repeat the steps until you get a good selection ready for the powder.

Mark the size!

Before you add the powder, you'll want to mark the size.

Using a ball point or permanent marker, designate the ejection charge size on the side of the tube, so you will know what amount to put in and then what size it is when you are ready to use it.