824tsv, I used one of those little foldup magnifying things to see how many holes there actually were. Mine is exactly like yours heavy barrel, 14-3. All I can find is the one pin. So if I remove the pin and do manage to get the old base and sight blade off will have to order an sdm gold bead front sight. Which also means that I will have to have someone mill a slot in the base for the new gold bead sight. Does this sound correct to you?. My 624 44 special, 24-3 4" bbl and my 24-3 3"bbl all have two pins holding the sight base in place. On the 624 and 4" 24-3 they used domed pins but the three inch 24-3 they blended them with the metal surface.Frank