Razzputin

Hello every one. My name is Sheldon and I am new to this site. I am 20 years old and am learning to work with metal as it is a passion of mine. I have almost finished setting up my smithy and the last things i need to do are mount my blower and fix my anvil. My problem with the anvil that I have acquired (for free I might add just so that I don't get told off for getting a kak anvil) is that it has been broken off at the hardy hole leaving about 1cm of the hole on the anvil itself. The rest of the butt has become lost in time as this anvil was part of the Boer war. Back then the English use to break off the butts of the Afrikaners anvils so that they became less useful as you can all imagine. My question to you all is how (if at all) would I be able to make a repair of this? I had an idea of setting up a square tube (10ml walls) the same dimensions as the original hole sunk into my anvil base and then welded to the broken off edge of the anvil. I can do the same next to it for a pritchel hole. My worry is will this rig be strong enough to withstand the beating a normal hardy hole gets? Or will it just sink deeper and deeper into my base eventually breaking off the anvil again. Many thanks and may the metal we forge be of the best. ps. If photos are needed I will post them.