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Replacing a threaded stem and crown


Joshua

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Hello, I discussed an Invicta watch with an NH35A movement a little while back. Upon doing my research it seems I need to replace the stem and crown, or at least the crown. Again, from my research it says I need to drill out the old threaded tube and replace the threaded tube with a new one that matches the new crown in question. My first question is how do I measure for the tube, I for the most part know how to measure for a crown, but I know there is a case side (the part that fits into the case) and an outside (the portion with the threading) diameter. Is just measuring the outside diameter sufficient in finding a suitable replacement and if not how do I measure the inside diameter because it seems it's in the case itself. Furthermore, do I use a drill bit that is the same size as the tube or do I use one that's slightly smaller? Second question is what drill and bits do you suggest getting preferably a set and what other tools will I need? If you guys could link me to them that would be wonderful. Lastly, will replacing the stem, crown and tube fix my problem of the stem and crown flipping the date as I'm unthreading it, details to the problem are in my original post.

Sorry for such a long post, but help would be highly appreciated. 

-Josh

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49 minutes ago, Joshua said:

 Again, from my research it says I need to drill out the old threaded tube and replace the threaded tube with a new one that matches the new crown in question.

If the crown is damaged that is what you need to replace, not the tube. 

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Invicta doesn't like to give out parts and this is my project watch. I bought it so I could work on it. Would just buying a bunch of threaded crowns on ebay and hope one of them fits work? I honestly just want to know how to fix this. I've never dealt with threaded, only the standard push and pull.

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2 hours ago, Joshua said:

Invicta doesn't like to give out parts and this is my project watch. I bought it so I could work on it.

They may not supply parts to individuals but not giving P/N is unheard even from the likes of Swatch group or rolex. Try with an authorized repairer or a seller that knows what  he is selling. Going buying at random, or adapting parts when the original is available is not a good approach. Also, in many cases damaged thread can be repaired.

Edited by jdm
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2 hours ago, Joshua said:

So I just go look up an Invicta store near me and go there? Also, I'm pretty sure it's the crown. When I unthread it I dont even feel the pop, I have to manually pull it out more.

Nowaday everything is done online. As you describe it's not a problem with threads but the the crown spring perhaps. If you really want to do yourself you need to take it apart and examine all parts to understand how it works, and where exactly the fault is.

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29 minutes ago, Joshua said:

I see, but regardless I need to replace the crown, so if I can't get an original from Invicta what do I do?

Research is the answer. You can find everything that anyone here can find, Joshua.  https://www.esslinger.com/watch-parts-screw-down-threaded-watch-crown/?gclid=Cj0KCQjwwb3rBRDrARIsALR3XeaiBsx7T3mtzIW32zvggp175aoZWdkdWaJl5pKPaPUVxhND9clt_ukaAnSQEALw_wcB

AND

https://www.ebay.com/itm/Original-INVICTA-Screw-Down-Watch-CROWN-7-5mm-Tap-10/163769860380?hash=item262171c11c:g:RSQAAOSw01pdI1m5:sc:USPSFirstClass!31721!US!-1

Edited by DavidMasters
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