Wiggler Center Finder with Edge Finders, 7 Piece Set

Wiggler and center finder along with four interchangeable attachments is useful for various applications. The interchangeability of the attachments is such that the attachments are snapped in the chuck without removing the collet nut and are clamped by the ball swivel joint which permits adjustment to true concentricity or angular position.
The Pointed attachment is used for locating working centers quickly and accurately. The Spring tension on the ball of the point allows guiding the point to true concentricity to enable the work piece to be brought in perfect alignment with the machine spindle.
The Ball attachment is useful in locating the work by bringing first the contact ball against the work and then indexing the work to the required position relative to the spindle.
The attachment which has a small disc of diameter 2.5mm (0.1") at one end is used in confined areas such as shallow holes and or slots.
The offset attachment is used for checking run out and concentricity as well as center distances, straightness or alignment of flat surfaces.
The set has two edge finders. The first is extra long while the second is a double end cone type.

How does this gadget work? What are those different attachments for? See How to Use a Wiggler.

Here is how to use a wiggler.