I soaked my sight in diesel for a day, them blew it out and soaked in Kroil for a day.  Laid it on a cloth covered anvil and tapped it once.  Came right loose as advertised.  Thanks.  The lock screw was loose enough to just screw it out.  I marked it and took it out with its spacer.

There is a tiny dark spot here and there on the surfaces that must rub when it moves. I'm rubbing all surfaces with CLP.  Anyone have a thought as to rubbing the rough dark spots with 0000 scotch bright etc.?