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The Brandt Built Ocular Housing Anti Cant indicator uses a Fiber Optic Lead for the light transmission from the MV3.
Brandt Built has had quite few customers reach out wanting spare fiber optic leads, for that "just in case" scenario, or a mistaken cut during installation.
This kit includes one 36" fiber optic lead, which is the same as what's included in all of Their kits. To date they haven't had any reports of fiber leads getting damaged during use.