[abasir]

I'll spend some time this weekend to search for the said knife. Most place I went only have the regular type that does not swivel and that's why I was thinking rigging up a holder with some roller bearing.

Also, the tip is not centered around axis of rotation. I'm afraid that when the knife is lifted and move to a new location, the tip rotates thus creating an offset from the intended position.

Thanks for the links. I don't know such swivel knife exist ;o