You can see a video of this finger top here redirectingat.com/
I'm no expert turner but hopefully I show enough setup and a couple tricks to make setup and turning easier. This is one of my first projects and I have no training on a lathe so feel free to make corrections to any of my steps.
Step 1: Tools and Materials
As far as wood goes you will need a small piece of a close grained hardwood. I am no expert in wood types so I just go around picking up different types and playing with them until I find one I like. I dont know what type I used it was just a 2" log I found on the ground. As chipf mentioned in a comment make sure the wood isnt green, meaning its dried for an extended period. Green wood will shrink and warp as it drys making something that was circular when you turned it change shape over time.
*You'll also need a scrap piece of larger diameter wood atleast the size of your faceplate. You screw your faceplate onto this and glue your piece to the other side.
If you have a chuck then you dont need to do this, you can just chuck your piece of wood.
Step 2: Setup
After mounting the scrap wood, cut the piece youll be making the top out of about an inch longer than the top. You want the cuts to be as sqaure as possible as it will make truing the piece easier.
Now just put a big blob of hotglue on the bottom of piece and stick it on the scrap wood. Then go around edge filling in any gaps.
Step 3: Start Turning
After everything is set up put your lathe on low speed (for me this means putting the belt in the lowest position, but varies from lathe to lathe). Use a low speed because the piece in not yet trued. If you would like you can tighten a live center onto the end but you will have to remove it to do the face work so I didnt bother.
Choose your preferred roughing tool, I like a gouge that I follow with the skew for a smoother finish but whatever works for you. Slowly introduce it to the piece you dont want to go to quickly here or you will catch an piece of wood that sticks out, this can rip the chisel out of you hands or knock the piece out of alignment. Bring the piece down to an even cylinder slightly larger the the outside diameter of you top. Mine is about an inch across so I made an inch and half cylinder. I also made it about a half inch longer than the top.
Step 4: Begin Shaping
Here you just remove a small amount from the handle and shape the outer part of the main body. You can make this anyway you like but I like the look of a dome shaped body.
Step 5: Hollow It Out
Then when your satisfied with the thickness of your walls get a small skew carefully shape the tip it should be a little less than 1/4" long, you can check how the tip is doing by touching the tip, this gives you a good feel of how well it will spin on your finger.
Step 6: Shape the Handle
Step 7: Sand and Wax
I start with 220 grit sand paper and then use 600, I then use the 600 to apply briwax to the piece, then I use a rag to wip off excess wax and polish it into the wood.