I am installing a string of three granite lamp posts to replace an existing string of wooden posts. The posts are cored. Should I try to snake the existing wires through the hole, which will probably require a splice inside the post, or should I try to install an LB on the side of the post. If the later, how can I drill the post without cracking it? If the former, how can I avoid pinching or crushing the wire when the 400 pound post drops in the hole?