Here are some pics showing the stem, not the best but it's what I have while I'm at work. Should give you a good idea of the finished product.
Has for how to do it, here is what I did;
You will need some Wet and Dry sandpaper in various grits (I wouldn't go lower than 400 and you will need to go up to at least 1200 or 1500 for a smooth finish). I used a mask to protect against dust and also use gloves.
Start at 400 to remove the bulk of the clear coat and decals, you can tell if there is still clear coat or decal as the dust will be white in appearance. When you hit carbon the dust changes to black. Once the majority of clear coat and decal has been removed proceed to a finer grit and repeat, wet the paper down to reduce dust and provide a smother finish. These steps are to reduce the appearance of fine scratches. Keep going until you reach 1200 or 1500.
Once it's finished clean the stem really well by washing and cleaning with either alcohol or other paint prep product. I used a matte finish clear coat from a rattle can or you could protect with 303 and reapply as needed.
I painted over the white eventually with a paint pen as I liked the silver cutouts on the face plate.