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Hi Johnnie , Hopefully you didn't inadvertently knock the yoke off of the groove on the clutch wheel . If the little button is stuck down , that means that the setting lever is not seated properly and not allowing the small nub on the setting lever to engage the grove on the setm. This happens sometimes when replacing the stem . First thing is to use the stem and crown or a small screwdriver in the stem hole to gently wiggle the parts into alignment . Doing this will work more often then not . If this doesn't do the trick you have to remove the dial to access the setting / winding mechinism to align the parts ,...usually the yoke back into the clutch groove as I previously mentioned . Your watch is a bit more complacated because of the gear that turns the inner rotating bezel . Attached is the PDF tech sheet for the Seiko 6106 , which is the base movement for the 6119 . You can see the parts I'm talking about ....Good Luck.... 6106A.pdf

You'll need the height, thickness and length of the spring plus the inside diameter of the mainspring barrel. Once you know this you can go to a site like Cousins UK (other parts suppliers are available!) to see if you can find a match: https://www.cousinsuk.com/category/mainsprings-by-size-watch-pocket Mark has actually done a nice informative video available at: https://www.youtube.com/watch?v=CZfFkv0FLX4 Edit: Stuart ... we must have been writing a reply at pretty much the same time as yours only appeared once I'd posted mine! :-)

If you are in the uk, then the BHI has a list of qualified repairers. Search for someone who specialises in vintage watches.

From your description it sounds like a simple case of a slipping mainspring. You don't need a Rotary specialist for this and it's a pretty simple analysis and fix situation. If a mainspring replacement isn't something you can attempt yourself (and I say this because any of the regular contributors on this forum could easily do this but I note you're a new member so assume you might want to leave this to someone else) then doing a search for an established watch repairer local-to-you is probably the best idea. And if the watch repairer is going to do this repair and this watch is something you want to use and keep long term - which it sounds like it is as a special 18th birthday gift - then you should have it serviced too i.e. a general cleaning and oiling.

On a lighter note, I have just received a £5.99 watch that comes with a lifetime guarantee, when the main Spring breaks it slashes your wrist!

Yes--there is Bulvari, Bolivia and Buloga.

Another (possibly final) update on the Seiko 5 Sport watches... I've managed to collect all 5 in the series with the latest having a red dial and blue band. I'm just thrilled with it: https://www.amazon.com/gp/product/B00H3WT928/ref=oh_aui_detailpage_o00_s01?ie=UTF8&psc=1 3 of the 5 watches are running superbly -far beyond my expectations. I've been keeping them wound continuously and taking turns through the day wearing them. One of them is amazingly only 8 seconds advanced from when it was set well over a week ago. Two others are running within +7, -2 S/day. The red one just arrived today and is too early to tell. The blue one has defied my initial attempt to regulate it and is "misbehaving" at +10 to +13 S/day. I shall try again soon to improve it. Finally, I'm working-up the nerve to take one apart. Naturally, I've grown fond of the ones I already have so, I will purchase a test specimen. I'll let you know how that goes when the time comes. Regards Ray

Warning: I am NOT a horology technician but, I am experienced in tool & die making and have a good bit of background working with zero-tolerance (and negative tolerance) fixtures and the like. Find a way to gently warm-up the case and as soon as that is accomplished, put an ice-cube on the back. As soon as the back is cooled (yet the case is still warm) use your case opener. Heating the case will expand it, cooling the back will contract it. Hopefully this take you out of the realm of zero-tolerance fit. Regards Ray

Everything you need to know (and some things you don't) is here. http://www.vintagewatchstraps.com/blogmainsprings.php In practice, any of those springs should work fine.

Nice write-up for an interesting movement. Even though those Diafix springs can be a real headache (it gave me shivers just seeing them in the pictures), that appears to be a high quality Seiko movement. I especially like Seiko's use of balance bridges in their better movements; they fly a bit under the radar but put together a solid watch. Great tip regarding unwinding the watch in fluid. I can see how that would be helpful in both cleaning the pivots and jewel bearings. Nice work and thanks for sharing!

Find a discarded treadmill and use the motor & controller from that. Usually zero cost for the treadmill. You would only have to adapt a pulley to the motor's axle.