I'm not waiting for Williams to re-design as Steve said they gave no indication of timeframe. Instead Im copying Steve's ingenious knurled head bolt fix. If I can sort out how to, I'll post photo's of this process as I do it....... thats assuming I don't mess up.
If there are no further comments by me on this subject in the next few days, it means I've damaged the beautiful umbrella holder and have gone down the britmog line and got some PVC pipe.