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one thing to note with the clay soils - they will expand and shrink with moisture content - to help reduce this effect of continual movement of the soil please consider a packing sand buffer before you pour your peir base. to give an indication of the shrinkage. I allowed for a 100mm for my backyard setup. so far it seems to be working. also having a seprate floor is important as any movement can be picked up by the mount, no matter how carefully you shuffle
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