cityfiddle

My Calcutta 300TE, paired with an 8ft. Carrot Stix Microguide, was casting perfectly, but was due for its first thorough cleaning.... I watched the Shimano Youtube video....I can do this! Way wrong... After reassembly, it backlashes with all brakes engaged and the casting control tightened so the lure barely creeps in free spool... The overrun can begin anywhere from the beginning to the end of the cast. It is fully spooled (eighth inch from lip) with fresh 12 lb. fluro....Aside from attempting this myself, what did I do wrong, and what do I do now?? Thanks, Sid A_