I have made friction primers from a thin brass tube. Drill a small hole through the tube, near to one end - wide enough to accept the pull string of a "Party Popper". Insert a Party Popper through the bottom end, string first.
Push in until the string appears when you look through the transverse hole you drilled.
Using a toothpick, poke through one side of the tube, and push the end of the string out of the other side.
pull up the Party Popper gently until it reaches the drilled holes.
I improved the reliability by poking a glue-covered wire up the bottom end of the tube and sprinkling some fine black powder into the tube. You then simply tie the end of the string onto a keyring or a curtain ring.
The lanyard has a spring clip on the end of the rope. To use, prick the charge, then place the primer into the vent, then attach the lanyard at the last moment. Stand back, and fire by pulling the lanyard quite smartly, and slightly downwards. The primer goes off with a loud CRACK and is propelled to quite a height by the blast.
They can be picked up and reloaded many times.
The reliability is around 80%........ not as good as igniter fuse or loose powder.
Richard