Simple question i'n sure, if you know the answer. But i'm thinking of purchasing a dovetail jig and have researched on various sites and watched a video, my only remaining question is after using the jig will i need to fininsh up with a chisel? the videos/images i have seen seem to show one of the 2 routed pieces to have a circular shape to it. if anybody could quickly detail how they use their jig and whether finishing up is needed i'd be very grateful. cheers guys.