2001 Subaru Legacy

Other Category problem
2001 Subaru Legacy 4 cyl All Wheel Drive Automatic 20000 miles

2nd hand, when I bought it, had a subaru spoiler installed by previous owner, now left side of spoiler is detached, I think the screw came off. I bought similar screw but still wobbly, do I need to tighten it more? Do I need a nut or something? Maybe something between the screw and metal? Should I seek professional help? Thanks
February 11, 2008.

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