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Whether installing on a replica or a vintage this will help you keep your spacing even and your grips at 90 degrees from the base. Use this along with the appropriate Guide Lock to install your grips. This is spaced for 6 grips on The Force Awakens (Maz version) lightsabers. Use with this lock, this rivet guide, and this grip cutting guide.
PLEASE NOTE: This is designed for grips that are approximately 13.3mm wide, such as Wannawanga grips.