To my eye, the dovetail HAS to be matched to the flats of the barrel if it is proud of the flats when installed, anything less is unfinished. If the dovetail is by chance smaller than the width of the flats it needs to be centered, anything less is unfinished. I also agree that staking can look awful, and that when fitted well isn't really needed, but a tiny roll pin through the sight base into the barrel disappears. It ensures nothing moves and is how I have installed sights on everything I have installed sights on for 30 years. Self loading unhandgunmentionables taught me that it is a better way if the firearm is to be depended upon. Stuff happens and sights get smacked on guns that get used. Knowing that if it is still there and vertical it is good is insurance I won't be without. If it isn't vertical it can usually be smacked back vertical and carry on until it is convenient to replace it, Do not use cast sights as they will break off with relatively minor impacts, if you do at least make sure they are soft.