Seiko Mod: the complete beginner's guide

Before touching a screwdriver, you need to understand the logic of modding. A Seiko Mod is built around a Seiko automatic movement (NH35, NH36, or their variants). This caliber dictates compatibility for all other components: case, dial, hands. The beginner's trap is buying parts that are incompatible with each other.

The first decision: assemble yourself or order a piece assembled by a watchmaker. Home assembly requires specific tools (watchmaker's screwdrivers, hand puller, case back press, dust blower), patience, and risk tolerance. Scratching a new dial or bending a hand on the first try is common.

For a first mod, the safest route is going through a specialist. You choose each component through an online configurator, and a professional watchmaker assembles the watch in their workshop. You receive a tested, water-resistant, warranted piece. That's how most enthusiasts start.

If you choose home assembly, here's the minimum kit. A set of precision watchmaker's screwdrivers (not DIY screwdrivers, they're too large). A hand remover to extract hands without scratching the dial. A hand press to set the new ones. A case back opener tool. A holding cushion to secure the case during work.

Consumables: silicone paste for gaskets, a dust blower, anti-static gloves, and a watchmaker's loupe (x4 minimum). Good desk lighting is essential.

Total tooling budget: between €50 and €120 for a decent kit. Cheap €20 kits on Amazon should be avoided, the tools break quickly and damage components. Investing in proper equipment from the start saves you from buying twice.

The most important advice: practice first on a cheap movement before working on your final components. A replacement NH35 costs €30, that's the price of learning.