Fuse hole too large?

For that fuse anyway. Seemed like a too-loose fit. It seems like a spark from the burning fuse could fall in that gap and set the thing off sooner than intended.

Neat thing though. Could easily be made in larger sizes.

It did look like smokeless powder was poured into it in the video. And not enough smoke for black powder when it went off. Makes sense, probably plenty strong for smokeless pressures.

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