Very easy to understand and use. Depending on the shape of the waveguide, it can be difficult to cut and shape with scissors. A razor/knife might be easier. A bit messy to clean as it leaves dust/particles where you cut and can break/fall apart with too much pressure. Do not bend too much when installing, otherwise it may break and become unusable, fall out, or leave a gap in the waveguide. Despite these small issues, it fits perfectly and works with the precautions mentioned above.
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