SLAB - Slabbing with a rolling-pin
Slab rolling with a rolling pin. On a sheet of canvas put the clay already prepared, press it out to form roughly the shape you want, circular, square or rectangular. Take a pair of bars that are the same size, put one on each side, then with a rolling pin that is long enough to rest on both bars, roll backwards and forwards over the clay to flatten it out. Reverse it several times to make sure both sides are without faults and continue until the rolling pin rests on the bars and cannot flatten the clay any more. Then you will have your slab.