Detonation wavefront controller

A kit comprising:

• a first part comprising:
• a detonator holder, and
• a first aperture having a first width and a shape which is substantially a cyclic polygon, substantially an ellipse or substantially circular;
• and
• a second part comprising a second aperture having a second width larger than the first width, the second part separate from the first part and engageable with the first part to at least partly assemble a detonation wavefront controller with the first part at least partly received within the second part, the first part moveable relative to the second part to configure the detonation wavefront controller at least between:
• a first configuration with a first distance between the first aperture and the second aperture, and
• a second configuration with a second distance between the first aperture and the second aperture, the second distance larger than the first distance.

A linear shaped charge comprising a part configured for engagement with a second part, a first part at least partly receivable within the second part,

• the first part comprising:
• a detonator holder, and
• a first aperture having a first width and a shape which is substantially a cyclic polygon, substantially an ellipse or substantially circular;
• and
• the second part comprising:
• a second aperture having a second width larger than the first width,
• wherein, with the first part at least partly received within the second part, the first part is moveable relative to the second part to configure a detonation wavefront controller at least between:
• a first configuration with a first distance between the first aperture and the second aperture, and
• a second configuration with a second distance between the first aperture and the second aperture, the second distance larger than the first distance.