I came across a website a few years back on reparing cracked cd's . In the photos the guy used one of those small blowtorch lighters that the crackheads use to heat the crack. He had it on a piece of glass to keep it flat when heated/melted .Try a search for it under cd repair . If it fails you can always take up the crack habit with your new blowtorch and forget about it :)
Good luck !
Phil, March 2007