Get more chisels.
Buddy Hendricks and I had to chisel mine out of my 12a at Moroso recently. I had the same problem with the angle, but another racer came to my rescue with some smaller chisels. Using them and some good old screwdrivers did the trick.
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Rodney Williamson
#93 IT7
www.titaniummotorsports.com
Buddys' website:
www.floridaperformance.com