So the elusive missing post is found
I had a La Marzocco basket that was fitted to a Pullman flat tamper This was sold to a lucky CS member
And like you ordered a convex tamper but a Pullman Barista fitted to a Synesso basket
It makes perfect sense to match the profile of the Group Head water screen with the tamper one uses
I know others will not agree, but the convex tamper works for me.
P.S Happy Birthday