It is known to secure a panel 1 within a trough 3 by placing one edge of the panel 1 within the trough 3 and filling the trough with resin 21. Once hardened, the resin 21 holds the panel 1 in place securely. However, panels 1 thus secured cannot be removed easily if damaged. The present invention provides a barrier 11, 13 for preventing flow of liquid resin 21 along a length of a trough 3, and for receiving a panel 1 thereon. A panel 1 may therefore be secured within a trough 3 with a reduced amount of resin 21.