Posted By Chris Pope They abandoned this at the last revision before this one stating somewhere that you should follow manufacturers guidance. Nevertheless there are some benefits in rule of thumb - easily communicated and remembered.

Posted By Ken Taylor This is revision 4, Chris. Revision 3 contained the guidance. It was always general guidance but subject to the manufacturer's instruction's. However, most towers around are not bottom-weighted and I am concerned that the guidance that's been around for years will be 'lost' and manufacturer's instructions will be unlikely to be found within reach of people erecting towers. What was wrong with the general guidance for those without benefit of manufacturer's instruction? I suspect that most employers and operatives would be hard pushed to come up with these and may well have not seen any such thing. For many a tower scaffold before erection is a pile of bits in the corner of the store or yard from which you select what you need at the time! Scissor lifts and the like come with the centre of gravity fixed - whereas a tower is what you make it at the time.