This may not be news to a lot of you, but it might be informative to some (like me) who are new to "vintage drum restoration."
All Ludwig bowtie lugs are not created equal. I just discovered this after buying a couple of "new" lugs off ebay to have for spare parts. Turns out that the swivel nut bases in these "new" lugs are hexagonal while the swivel nuts in all the old lugs I've dealt with in the past have had square bases. The older nuts with square bases will not fit in the new lug casting. Also, the mounting base flange of the casting is thinner on these "new" lugs. I don't know if these "new" lugs are made by Ludwig or some after market replicas.
Hope this prevents someone making a mistake.