Manhattan stubborn cones

Brutus

CGN Ultra frequent flyer
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Collecting my BP goodies to actually shoot it. One big problem though. I replaced the original nipples with those from Dixie over a year ago. However, there are two that I cannot seat the small wrench upon. The other three are accessible.
Somehow I misplaced the one wrench that was narrow enuf to work. There must be deformations in the cylinder, prevents me from seating a wrench upon the two troublesome chambers.
Has anyone ran into this before with a hand tool trick I am not presently aware of?

Thank you....
 
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