I use plastic coffee stirrers. Cut to length on bevel. I use a pipe cleaner dipped in rubber cement, run through the stirrer. I use a plastic pour spout on the original 4F can... cut to just accept the stirrer tip. Tip the can & allow 4F to flow through into an appropriate catch container (I use an old alum ice cube tray). Right the can, remove stirrer. There will be a blob of rubber cement on the outside of the top, sprinkle with 4F. Check hole is clear, open with wire (paper clip) if necessary. Set aside in a drilled block to dry, begin again. Touch lindstock to the blob outside, fire is instant.
Fast ignition is desireable, before kids, pets, spectators can wander into the safety zone. It's amazing what can happen in the few seconds it takes for a fuse to burn down.