[audiomagnate]

The 7S25 movement in my SBDA001 titanium Samurai has died and I figured I'd upgrade to a hacking/handwinding NH35A. I can't even get to the first step, removing the 7S25 compatible stem from the titanium crown. Switching to a modern Samurai crown stem is not an option they are steel and too large. The stem feels "spring loaded" into the crown now but I can't unscrew it. It just spins within the crown.

 

[marcellolipi]

The 7S25 movement in my SBDA001 titanium Samurai has died and I figured I'd upgrade to a hacking/handwinding NH35A. I can't even get to the first step, removing the 7S25 compatible stem from the titanium crown. Switching to a modern Samurai crown stem is not an option they are steel and too large. The stem feels "spring loaded" into the crown now but I can't unscrew it. It just spins within the crown.

I would upgrade to a 4R15 movement.

maybe your project could be possible with these adapter

 

[audiomagnate]

Before I use an adaptor I have to remove the existing stem from the crown. Does anyone know how to do that?

 

[marcellolipi]

No experience with it. It’s pioneer work - also for a watchmaker.

 

[audiomagnate]

This just arrived from China. It looks good and screwed on smoothly. It's stainless steel and not titanium but I think I can live with it. This looks a little off however:

 

[audiomagnate]

 

[audiomagnate]

FWIW the stainless crown bugged me so I bought a 7S25 movement from Perrin in Canada and went back to the original titanium crown/stem. It's 100 original again and I'm loving it.

 

[SeikosandSwiss]

That's the way to go. Even a 7S26C brand new that often ship without a day wheel would have worked just as well.

I love my SBDA005 orange titanium as wel shown far left, it has the Yobokies black and gray (should be black and orange) insert as the original is just so faded in the orange section. Ti buckle on NOS OEM rubber HTF for this model