Seeking data/reports to address questions on the risks associated with
Annular Ring size.  In particular, as the mis-registration of the of the
mechanical drill to the PTH Pad moves towards a trace leading into the pad
the potential for an 'open' to occur increases.  Concerns center around
'thin' ring passing ET, but in field stresses cause fracture and crack
propagation to 'open' state.

Thanks, Chris