1.The material is bamboo.Gripping a work pices with two-jaw chuck and tailstock.

2.It is important to grab a work pices at the center of the two-jaw chuck.

3.Turning handle to 6 mm diameter. And, Put aluminum pipes in the handle.Glue the right short pipe to the handle. The long pipe at the center slides to the left and right. Also, put a crack in the tip of the square.

4.Using a urethane fill gap tape. I bought it for 100 yen.

5.Insert a urethane into the crack. Then slide the pipe of aluminum.

6.It is completion.

If you devise the shape of urethane you will be able to paint every corner.