This is a nice illustration from the information panel at the Garn Wen "cemetery" near Fishguard, showing how the capstones of the local burial chambers were put in place. Seems perfectly reasonable to me -- but while a mound of this size was probably needed at Pentre Ifan and some of the other rather spectacular megalithic structures, the Garn Wen cromlechs are so small and crude that hardly any mounds at all would have been needed in order to slide the capstones into position. Maybe they were just lifted and then moved sideways with levers and packing stones?
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