OK , when you cut out a tag , you just cut through the pin where it pokes out the top of the ear and put the new tags into the old holes, so long as you hold the sheep firmly then no ear damage should occur . For a replica tag you need uk number and individual number as on the remaining tag and is it EID or non EID , normally left ear ( standing behind sheep ) is EID tag , some tags have an e on the EID tag