On Sat, 13 Jul 2019 01:44:02 +0000, Alicia Harrison
m wrote:

we have replaced wood on garden bench. but it is wobbling side to side

We normally call that 'racking'.

it
has all its straps etc. does the wood lats have to be very tight into each end
?

To minimise racking, yes.

the sides wrought iron are Lyon heads which are old but I'm stuck on how to
get this right thanks

Ensure the slats are attached to the ends as tight as possible
(without crushing the wood etc) and if that isn't sufficient, add some
(two) diagonals across the back (could be wires or flat steel straps)
to further restrict said racking.

Even one diagonal would help.

Cheers, T i m