On Wed, 4 Nov 2009 09:47:54 -0000, dennis@home wrote:

In bars, a free to rotate hardened roller slows them down.

That was before the invention of super glue.

Super glue isn't that effective on metal and relies on fairly inimate
contact between the surfaces. Give the roller 1mm clearance and I
doubt super glue you have much effect.

--
Cheers
Dave.