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Making a Stem


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I am planning on making a stem for a repair I am doing. I have done the measurements but would love some tips on what to cut first. I just got a carbide tip graver with a refill tip and some stock steel. Here is the part and my measurements,6086da1e22c453dad17c9db13ea6b146.jpg711ce13abec0af5ec949298869deedbf.jpg

Taping could be a challenge as this is new to me.

 

 

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Why make a stem for a AS1950/51 . Are they hard to find? Or is it just for fun or getting some experience? 
Almost sure i have a AS1951 stem? 

I am just learning. 18S pocket watch stems are hard to find so I figure i will get some skills:)


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Ok, update. I broke the stem trying to die the threads. So i have started again. Here is the progress. PS I have ordered a double roller guide for filing the square.4aa23fd67926ad9d66fcf6f9deebb1b7.jpg4d0dcdb90f9c69e73a0298d04b4331d6.jpg38387517f39a3aafa9a0e21e128e5410.jpg62233b0cd8f6319df0f244d0ff24dfcc.jpga3d05b29a250f0ee13db60f880a89456.jpg9752d26e6efaaaa9c90925ad66cd6cb8.jpg8a454a17fa865d0ec2be9f59957d1105.jpge5dad77548fe3eddbc8fb934b6f2c680.jpg
Still need to carve out a small step, add the square gap and make the threads. Not sure if i need to heat up the steel to soften it prior to tapping. I am using tempered blue steel.


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