I have a Manfrotto 190XBROB Tripod that does not have provision for a hook to stabilise the tripod because the centre column is removable.
Have made up this detachable hook that clips over the bottom of the center post and is held by the existing spring loaded lug.
It is a tight fit and i had to re-drill the hole slightly but will do the trick, for the next windy night exposure outing.