VEVOR Compact Lathe Machine, Dimensions 2.76 x 6.3 inches, 24VDC 96W, Includes Milling Machine Accessories, Features 7 Adjustable Speeds Ranging from 4220 to 8450 RPM, Ideal for DIY Woodworking and

No, it isn't suitable for turning small brass parts.

There is a brass connecting rod attached to the motor shaft, and then the drill chuck is hammered onto it.

The rear tailstock pin has a shaft diameter of 5.97mm. This tailstock is a custom part, and we are not sure if there is a replacement part available elsewhere.

We can not add a drill chuck to the tail stock

If you are referring to the Buddhist bead fixing needle of the product, it is equivalent to DIYing the ball using a lathe, and then using accessories to fix the ball for grinding and polishing.