Assemble Watches
Blog
Part compatibility guides, platform comparisons, and practical advice for getting better watch mod results.
Fitment References
Check compatibility before you order
Inspired builds
Build a watch inspired by an icon
View all →Interactive build guides: pick from on-theme parts, preview the assembled watch, and open the exact selection in the builder.
Build a Rolex Submariner inspired Seiko mod
Plan a Rolex Submariner-inspired Seiko mod with compatible black-diver parts, a live preview, current USD pricing, and an exact builder handoff.
Open build →Inspired buildBuild a Seiko 62MAS inspired Seiko mod
Plan a Seiko 62MAS-inspired mod with compatible vintage grey-dial diver parts, a live preview, current USD pricing, and an exact builder handoff.
Open build →Inspired buildBuild a Seiko Turtle inspired Seiko mod
Plan a Seiko Turtle SRP777-inspired mod with compatible cushion-case parts, a live preview, current USD pricing, and an exact builder handoff.
Open build →Inspired buildBuild a Seiko Marinemaster 300 inspired Seiko mod
Plan a Seiko MM300-inspired mod with compatible professional-diver parts, a live preview, current USD pricing, and an exact builder handoff.
Open build →Quick References
7s26 to NH35 Movement Swap: Step-by-Step Seiko Upgrade Guide
How to replace a 7s26 with an NH35 in a Seiko mod build: compatibility checks, dial and hand transfer, movement holder, crown stem, and final testing.
Read →NH35 Compatible Parts (2026): Every Dial, Case, Hand & Bezel That Fits
Every NH35-compatible dial, case, hand, and bezel confirmed to fit: dial feet, hand tube sizes, and case dimensions. Check your build free before you buy.
Read →NH35 vs NH36 vs NH36A vs NH71: Movement Differences for Seiko Mod Builders
NH35, NH36, NH36A, and NH71 compared: specs, dial compatibility, day-date differences, and which movement to choose for your Seiko mod. Includes NH71 for skeleton, no-date, and modern builds.
Read →NH35 Movement: Specs, Dimensions & Full Compatibility Guide
NH35 specs: 28.5mm diameter, 21,600 bph, 41hr power reserve, hacking + hand-wind. Fits all SKX007-spec cases. Full compatibility guide for dials, hands, crystals & cases.
Read →Best NH35 Dials 2026: Sizes, Dial Feet Specs & Top Picks for Every Style
The best NH35-compatible dials in 2026 — 28.5mm diameter, date aperture at 3 o'clock, correct dial feet spacing. Top picks from Namoki and Lucius Atelier with fitment notes and style comparisons.
Read →How to Choose a Seiko Mod Dial: 5 Checks Before You Buy (2026)
Choose a Seiko mod dial that fits: check date windows, dial feet, and movement compatibility before using the free builder to plan it.
Read →Date Window Off-Center? Fix It — NH34, NH35, NH36 & NH38 Guide (2026)
Stop the date wheel showing through the wrong window: match NH35, NH36, NH38, and NH34 movements to the right dial before you buy.
Read →Seiko Turtle Mod: Compatible Parts & Fitment Guide
Seiko Turtle mod guide: find Turtle-tagged cases and accessories, then match movement-compatible dials before you buy.
Read →Where to Buy Seiko Mod Parts in the UK (2026): Trusted Suppliers & Shipping
Where to buy Seiko mod parts in the UK: Namoki for movements and dials, Cousins for tools and crystals, Lucius Atelier for premium dials and cases. Delivery times, import costs, and what each supplier does best.
Read →Best NH36 Dials: Day-Date Sizes, Fitment Specs & Top Picks
The best NH36-compatible day-date dials: 28.5mm diameter, day-date aperture, correct dial feet spacing. Top picks from Namoki and Lucius Atelier with fitment notes.
Read →Seiko Mod Hand Setting: Fit, Clearance and Beginner Mistakes
A Seiko mod hand-setting checkpoint covering NH hand sizes, hand clearance, seconds-hand risk, and curated tutorials for learning the technique.
Read →Seiko Mod Case Fitting: Seating the Movement Without Damaging the Build
How to think about seating a Seiko mod movement in the case: movement holders, low hand clearance, case fit, and tutorials worth reading first.
Read →Seiko Mod Chapter Ring Guide: Fit, Alignment and Platform Checks
A beginner-friendly chapter-ring checkpoint for Seiko mods: when you need one, how platform fit works, and why alignment matters.
Read →Seiko Mod Bezel Ring Guide: Platform Fit and Common Ordering Mistakes
A Seiko mod bezel-ring checkpoint covering case platform fit, rotating vs fixed bezels, insert requirements, and curated learning links.
Read →Seiko Mod Bezel Insert Guide: Fit, Alignment and GMT vs Dive Inserts
How to choose a Seiko mod bezel insert that fits the ring and makes sense for the movement: dive, countdown and GMT insert checks.
Read →Seiko Mod Crown and Stem Sizing: Cutting, Test Fitting and Common Mistakes
A Seiko mod crown-and-stem checkpoint covering crown type, stem cutting, trial fitting, and the best tutorials to read before trimming.
Read →Seiko Mod Final Assembly: Caseback, Gasket, Strap and Bracelet Checks
The final Seiko mod assembly checkpoint: caseback closing, gasket awareness, dust checks, strap fit, bracelet fit, and spring-bar sizing.
Read →Seiko Mod Crystal Swap Guide: Hardlex vs Sapphire and How to Fit One
A practical Seiko mod crystal swap guide covering Hardlex vs sapphire, flat vs double-dome crystals, crystal sizing, crystal press workflow, and common fitment mistakes.
Read →Seiko Mod Troubleshooting: Hands Binding, Dial Fit, Rotor Noise and Date Alignment
Direct fixes for common Seiko mod problems: hands binding, dial won't sit flat, NH35 rotor noise, misaligned date windows, and dust under the crystal.
Read →How to Mod a Seiko SKX007: Parts, Compatibility and Build Order
A platform-specific SKX007 mod guide covering cases, NH35 and NH36 movements, dials, hands, bezels, inserts, bracelets, and common compatibility traps.
Read →How to Mod a Seiko SRPD or 5KX: Beginner-Friendly Parts Guide
A practical SRPD and 5KX mod guide covering donor watches, 4R36 and NH36 layouts, dials, hands, bezel inserts, straps, and SKX007 interchangeability limits.
Read →How Much Does a Seiko Mod Cost? Budget, Mid-Range and Premium Builds
A practical Seiko mod cost guide with budget, mid-range, and premium build ranges plus build-time catalog price snapshots for cases, movements, dials, hands, bracelets, and more.
Read →Seiko Mod Hands, Lume and Fauxtina Buying Guide
How to choose Seiko mod hands for NH35 builds: hand tube sizes, hand styles, lume matching, fauxtina color, clearance checks, and common buying mistakes.
Read →The Seiko Mod Tools Guide: What You Actually Need
Most tools guides tell you to buy everything. This one doesn't. Here's the short list of tools that cover 80% of Seiko mods, what each one does, and what to look for when buying.
Read →How to Swap the Dial and Hands on a Seiko SKX007
A full walkthrough of the dial and hand swap on an SKX007 with NH35 movement, from opening the case to closing it up, with the common mistakes worth knowing before you start.
Read →SKX007 vs SRPD: Which Seiko Platform Should You Mod?
The SKX007 built the Seiko mod community. The SRPD5x series carries it forward. If you're choosing between them as a mod platform, here's what actually matters.
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