example widened portions 132 or 134 can be positioned on core ring 158 in tandem as depicted in fig1 or alternatively not shown core ring 158 can comprise only portions 132 only portions 134 a combination of portions 132 and 134 or combinations of slots with and without portions 132 or 134 it also should be understood that portions 132 and 134 are not limited to the size and shape shown in the figures the underlying principle is that the portions are sufficiently sized and positioned with respect to the particular turbine blades installed on the core ring to form a discontinuity with respect to the capillary action for the particular joining material used the location at which the joining material is applied to the core ring also is a factor as to where edge 157 is bonded to surface 165 for example in fig1 braze paste applied proximate circumferences 167 and 169 flows along the channel formed between edge 157 and surface 165 toward slots 161 and 163 respectively until the paste reaches portions 132 and 134 respectively upon reaching portions 132 or 134 braze paste flowing along the channel formed by edge 157 and surface 165 stops flowing due to the void on surface 165 resulting from the open paths associated with the widened portions.