A laser guide device includes a laser for emitting a laser beam along a guide axis. A mounting system is operatively arranged with respect to the laser and is configured for mounting the laser centrally within or adjacent a cylindrical mouth opening of an object. The mounting system includes at least one grip arrangement for mounting the laser guide device on a rim defining the cylindrical mouth opening. The, or each, grip arrangement defines at least one grip formation for bearing against one of a radially outer and a radially inner surface at the mouth opening.
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