I designed this tool to help remove the caseback on the original Seiko Arnie (H558) without marring or scratching the caseback. The tool is manufactured out of Nylon using a industrial HP Multijet fusion 3d printer for maximum strength. This tool had no issue removing my back and really helps make battery and o-ring changes easy. There is a possibility it could struggle on backs that have been over torqued or corroded. Tool is marked H558 – 34.0 (Reflects Inside diameter of the notch dimensions in millimeters) and the S to indicate Seiko. This tool can work with any Seiko with similar notch dimensions as listed and shown in the images.ID: 34mm OD: 36.72mmNotch width: 2.30mm
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