Abstract: A base is provided for horizontally supporting a magnetic tape cassette with its tape access door held open. Magnetic tape from the cassette is threaded around a plurality of removable guide posts and is held horizontally within an elongate recess by a pair of hingedly mounted clasps. A groove extends diagonally across the recess for permitting a cutting implement to slice through the length of tape aligned in the recess. Wrinkled segments of tape are removed by feeding the tape to the appropriate location in the recess, closing the clasps and making the necessary cuts. The cut ends of the good tape are then abutted in alignment within the recess. A splicing key guided by detents in the base is used to affix the adhesive layer of a splicing tab over the abutting cut ends to thereby splice the tape together. The base is formed with a plurality of receptacles for holding accessories such as the removable guide posts, a screwdriver, a pair of scissors, and a knob for rotating the reels of the tape cassette.