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Stage 2
Insert a reversible leg in to a 1200mm base to start and then continue with this process alternating between a 800mm base then a 300mm base until you reach the end of your run, then finish with a 1200mm base.
If you cannot or do not want to fix to a wall then you should always start and end with a 1200mm base for all class B installations. For Class A installations 1200mm bases are not required you start and end with an 800mm base again alternating with the 300mm base along your run.