[R-390] IF core size

[richard may]

   I  used  to  know  this but lost my info. Can anybody tell me the size
   (diameter) of   the   slugs  in  the  IF  cans?  I  see two  sizes  in
   catalogs that  are  most popular. 5/64 and .100 inches. Any help would
   be appreciated. Richard, W8FCW