Originally Posted by
contender1
"I have had a few modified with the front sight blade cut off and the base milled with a grove in it to take a Ruger front blade. A small roll pin holds the new blade in. "
^^^^^THIS^^^^^
On a BLUED Ruger SBH,, the front sights are silver soldered on. Removal & replacement will also require a reblue. They are not screwed on.
Another option is to gently heat the original one, remove it & D&T the bbl for a screw on sight,, but there is the issue some folks have with higher pressure loads & the small possibility of D&Ting too deeply.
By far,, the most common method is to go the route of milling off the rest of the blade,, having a groove cut for a replaceable blade & install a new blade.
There is a similar question on the ruger forum dot com,,, where member Hondo offers an EXCELLENT tutorial on how to DIY using a Dremel. Look in either the revolver section or the gunsmithing section. I do believe it's in the revolver section. If you can't find it,, PM me & I can send you a copy. I saved it for future reference for folks.