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@Pragma
Ground anchors that work... ?
Good point. Most people don't realise that the concrete is the weak point, at least it should be compared with any decent anchor. Brick is weaker still and block more so, as a rule. Hence, it is important to have at least a 3-bolt fixing on any good anchor, and spread out. The worse the substrate, the larger the fixing area required to get a good anchoring effect. You can compensate for virtually any grade of substrate, but anything fixing to a small area or using just one or two bolts can't be any good IMHO.