The problem would be in setting up the boring bar to cut ONLY the cap, without making the block side bigger. Based on the machining skill that's been demonstrated so far, I think dealing with that shop any more would be roughly equivalent to getting brain surgery at a drug store!
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!