I'm not sure if the sight set up is the same as my henery 22 mag but mine had a dove tail rear sight on the barrel. I removed the sight ramp then useing a piece of brass the diameter of a pencil tapped the sight out of the dovetail slot. A small tac hammer is all I used to tap on the brass with, it was in there pretty good so I had to brace the rifle in a padded vice. The brass will not scratch any surfaces but you will have to remove the surface residue it deposits. I'm sure there is a gunsmithing tool for this made but I made use of what I had.
woods