I need to remove the front sight from my Henry SXS. There is a notch across the base in front if the blade which I assume is for tapping out the sight but I tried a couple times and it won't budge. I haven't hit hard as I don't want to mess something g up and don't really have anything other than a small screwdriver to engage the notch. Hopefully it is not soldered in place. Any suggestions how to engage the notch to drive the sight out?.