I made up two bits of wood, about 50 x 20mm and slightly wider than the rails on the pin. On the underside of these bits I nailed a few small blocks of wood to locate them between the side rails. These sit across the cabinet and are used to support the raised up playfield to the height of the top of the cab so you can work on it.  It works really well with the pf upside down and ok-ish with the pf the normal way - you have to jiggle things a bit to avoid fouling bit underneath.