I like to use a large tapered punch, maybe a foot long or more, insert it into one of the bolt holes, and rock it forward and back. The cap will move, but it's a struggle sometimes!
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!