Aren’t sleeves recessed in the ground enough to hold the unit in place? Why do the uprights absolutely have to be held in place with concrete?
It is absolutely essential to hold the uprights in position in the ground using concrete foundations to achieve a lasting, stable and secure installation. We firmly advise against all other methods, as they do not achieve the necessary lasting stability.
Our attempts to use recessed sleeves have not been worthwhile. If the sleeves were too wide, the uprights were too loose and not firmly anchored. If the dimensions of the sleeves were too tight, dirt and earth quickly got between the contact surfaces and meant that it was no longer possible to pull the posts out of the ground — at least not without excessive effort.