rebuild a torque converter?

X2 on the flushing machines being gone. I was given a 727 tranny and torque converter by a friend. It had been sitting outside under plastic for 4 years. I took them to a local tranny shop that is now owned and operated by the son of the original owner. He is in his 50s and still works on all types of older transmissions as well as modern ones. He told me to drain and refill the torque converter twice with fresh fluid before using it. I asked him about rotating the inner shaft to make sure I flushed it entirely and he said that if I had the correct tool to do it then do it but that it required some effort to turn. He told me wasn't neccessary.