Welcome to the new and improved Proflex / K2 Tech Forum!
I think my nephew has a bit more faith in me. The headset went in today with out a problem. Used my handy dandy homemade headset tool. Like many of you have I am sure. Threaded stock with large washers and nuts. Ah yes used a similar system many times,never had a problem,resently started using a suitable size sockets inverted with a large washer on top,found it gives a slightly straighter initial push as the shank sits snuggly down inside the cup boss,Simon.