Juvela - You were right KAG Not WAJ (not sure where that came from)

Big Block - I showed the seat to bertinjim who felt that while bolt could be turned to add tension but I should just ride it.

The small cracks to the seat appear to just be on the surface but will watch carefully. I applied PB Blaster to rag them rubbed the seat bolt so hopefully nut will move easily.

Will give it a whirl and report back