need some advice on welding up holes?

[lasher78]

ok need some advice on welding up holes in floor board? i have a few holes on the inclined area of floor board on drivers side close to where the dimmer switch should go. one is prob rhe size of a nickel. now i used to weld on railroad cars for a living so its not the welding i am questiining, its how to weld the hole up without the weld falling thru. when we had a large hole on a rail car to fill we had a copper block to place behide area and just started layin beads down, filled the gap and removed block. but i sont have a copper block so what would i use to place behind holes to hold the weld bead from falling out? any suggestions will be greatly appreciated. thanks in advance
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