1.I chuck material. and I makes a hole with ø50 and 5 mm depth for collet chuck.

2.It chucks it with collet chuck. Then, I shave outskirts.It chucks it with collet chuck. e outskirts.

3.I cuts off to the part of shell and cap. The side of collet chuck becomes cap part.

4.I turn the inside of cap. It is enough in the skew if being a depth with this degree.

5.I removes a tool rest and I sets Threding-jig. Then, I removes the collet chuck as it chucking works from center shaft and I sets it in the jig. A cutter is homemade but it's good.

6.I turn the outside of shell.I used skew.

7.I sets a screw Threding-jig. Then, I sets in the jig like cap.

8.It saw from other side. I turns a blue handle and it forces a cutter on the work. A screw make is when turning a red handle. Let's threading, as much as three times.

9.A screw is finely threading by the way which rotates a work in the same rotation direction as a cutter. Let's threading to the tip from the root.

10.I forces cap into shell and I shaves outskirts.

11.I put the ornament of the thumbtack to the center. I used a planetcolor for the finish.

12.I opens cap. The screw turns smoothly.

Now, I evaluate a jig. I think that this jig is the tolerable result.
I want to attach the passing mark. A cutter is also good.
I am pleased if it becomes the good news of you, WT-300 user.
Threading jig