How to flatten warped mango wood tabletop slab?

[AntonT]

   

I have a mango wood slab I am using as a tabletop for a bar outside. 

One side has warped and sits proud of the base. 

I was thinking of putting wood above and below and clamping it down to allow me to screw it to the tabletop but I thought someone may have a better idea. 

See photos. 

[Noyade]

"I'll start by trying the low tech solution first."

Absolutely!

Sorry, one last whiteboard thought and then I will let it rest in your capable hands.

You never said if you wanted the top free of bolt heads?

I was thinking of round-headed bolts from the top, buried - but I think one problem would be that table frame was never intended for the slab and would be made of thin square tube?

Crushing forces to get that slab down - would most likely distort and compress the horizontal tube members.

Hence...

A welded thick plated 'U' section to absorb the forces.

Hope it makes sense.

Cheers.