Not being the type to just sit around I decided to beef up the original very thin part and have come up with the below solution. The seat now is as stable as ever and this new part machined 316 solid stainless will not bend in future,
I made up four of these kits including longer 316 shanked bolts, nylock nuts and washers and have only used one this far.
If anyone has wobbly seats please PM me and we can work something out.