magicalwonders
Established Member
I think it goes in the spindle instead of the collet and is used to help you ensure that the spindle centre is on your drawn centreline.
G.
It has a bolt in one end that unscrews, along with a split ring washer. I've never seen anything like it in any of the videos on Routers. You may be right about its purpose, but it doesn't seem to be a popular accessory.