I have seen this maney times to post lights and things the problem may be that depending on the size of conduit the that wire may be corroded in place, in the conduit. I have gotten some to come out but some of the lead sheath stayed behind. LOL Others come free no problem. I pretty much consider this an ungrounded system. The lead outer jacket is not very good for grounding. Almost all the systems I have found this stuff on were ungrounded.

Choose your customers, don't let them choose you.