How can I remove the specimen disc if it gets stuck or frozen into place? FAQ Report Moisture on the underside of the disc may have caused the disc to freeze to the quick-freeze shelf or specimen head. Apply concentrated alcohol (>70%) around the disc, and carefully remove. If the disc remains stuck, gentle tapping may be used. Do not use excessive force on the disc, especially if it is stuck in the specimen arm. Once the disc is removed ensure that the specimen head and/or quick-freeze shelf is dry and wiped clean.