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My Seiko SNK809 Watch Mod

Some hobbies area better left untouched. A couple of months ago a friend introduced me to the watch mod (watch modification) community and I haven’t stopped thinking about modding a watch of my own since.

My friend, Vick (left), pulled me into the watch mod land of no return.

The watch mod sub-culture: -Like custom cars, there’s a community of watching modding fanatics, particularly for Seiko watches due to its affordability and its beautiful and widely compatible automatic movement (the engine of the watch). People can find a plethora of aftermarket parts and tools to replace existing elements to make something uniquely your own.

Start with an end in mind.

After compiling hundreds of inspirations and researching a variety of shops and their watch parts supplies, I finally committed to begin my first mod.

Before / After

Modifications I’m making

-Seiko SNK809 as the base watch. (Amazon or eBay)

-SKX007 dial (I chose the SKX007 dial (as opposed to the SKX009) for the black backdrop and added a yellow seconds hand as accent and tribute to Braun and Dieter Rams. (eBay, Orion, etc)

-DLSwatch brand hands (DLSwatches)

-Sapphire domed crystal (Crystal Times, eBay)

-Milanese strap (Amazon)

Tools & Prep

Wear gloves (No fingerprints)

Clean work area (Saves you a ton of work later; cleaning dust and specks off from the watch is a pain in the ass)

Remove watch straps

Strap-free. Stage 1.

Step by step guide to modding my Seiko SNK809

1. Unwind the case back There are a few tools you can use to unscrew the back case. I chose the plier simply because I didn’t have other options at the time. It worked out fairly well.

Tip: Put masking on the case to add a layer of protection from accidental scratches. This saved me twice.

Optional—a watch case vice to hold own the workpiece

2. Remove the crown

Press and hold down this piece (crown release tab) to remove the crown

Tip: Use a toothpick.

Soft enough to not scratch the internal elements

Tip: Tape it down.

Tape down the movement rotor for easier access

3. Pop out the movement

Insert flat to the side to pry lift the movement

Some can softly tap the front side to drop the movement out of the case. I had to use a flat head in this case. The movement is a delicate thing, and all the steps above require no brute force.

To change crystal

I chose to upgrade the original crystal with domed sapphire crystal.

*Need crystal press

Having a decent crystal press makes all the difference. I purchased mine from eBay; buy cautiously with high rated sellers. This may be one of the most critical tools when it comes to crystal mod.

1. Pop out & squeeze in 

The crystal press typically comes in assorted dies to fit watches of most, if not all, sizes.

The bottom die should cover the bezel and not touch the crystal
The top die should be just big enough without touching the case
Level up

To squeeze new the crystal back in the case, follow the same step above. There’s no sure *clicks* to indicate a well-sealed crystal; you’d have to press hard on the crystal a few times and make sure all sides are leveled.

2. Seal the back and insert the crown (leak test)

To make sure you’ve done the right job, you’d perform a leak test. The pros would perform a pressure leak test with a pressurizer. In my case, a standard cup of water would do.

Finger crossed for no leak

Waterproof’d? Good.

To change hands and dial

For this watch mod, I kept the design simple including monochromatic dial and hands except for the second hand, which I added the yellow accent as a tribute to Braun and Dieter Rams.

1. Insert crown and wind to 12:00

Insert the crown back into the movement. No need to press the crown release tab that you used to remove the crown (not for this movement). Insert the crown and wind clock-wise to adjust the hour hands to 12:00. This helps with alignment in the following steps. No need to deplete the power reserve. You can change the hands while the seconds hand’s still running.

2. Slide protector and remove hands

Use any plastic cover as a layer of protection (always good to have protection)
Handy hand removal tool

Drop the hand removal tool perpendicular to the dial below the hour hand, squeeze tight, and pull them out of the staff. Might require slight force.

3. Remove dial (flat head)

Slide flat head into the small gaps on the side of dial
All the pieces
Day date wheels beneath the dial. How cool.


4. Place dial and hands (can be tricky)

Just as I’ve read through many other tutorials, this part may require the most patience. We must first intricately placing each hand back onto the center staff as the hands are fragile and can bend easily, so this part may take some trials and errors.

Phew, done.
My ghetto hand press tool

I would recommend the watch hand press tool. I didn’t buy one and had to improvise–something that can press evenly around the center staff and onto the hands. The hole for the pen was larger than the staff, so I wasn’t exerting the right pressure all around and caused the hands to bend. I had to carefully fix each hand after.

5. Make sure hands are aligned

Turn the crown and the hour/minut should land accurate at each hour. Align’d? Good.

Finishing touches

1. Clean all specks and fingerprints

Hope you’ve been wearing gloves.

2. Pop in movement, insert crown, and seal the back case 

Insert strap
Dome crystal

3. Inspect the watch


Hands, dial aligned? No smudge or specks? Baby’s still asleep? Good.

Grab a beer and show off your custom piece

This is the first time I mod a watch and am decently satisfied with the end result. I’d like to try designing my own dial in the future and/or paint over unneeded elements of existing dials to make the design cleaner.