Thanks BUCKIE for valuable and well researched info! Double thumbs up!
The Rogers "bread'n'butter" chromed brass lugs are known for stress cracks and breakage; a result of several serious design flaws. The first and most serious flaw the choice of thin, malleable brass as the material for the lug casings. Then the use of a very tensile spring backing the threaded receiver applies too great an upward vertical pressure directly against the lug shell where the receiver passes through a thin small tight fitting hole allowing no real side to side movement. The lugs are fastened to the shells by screws passing through two thin, flat, soft brass tabs folded under and into place from the ends of the single thin sheets of brass during the manufacturing. If all calfskin heads are used with these lugs their survival rate is somewhat extended, but they simply are incapable of handling the tremendous pressures required to tension modern plastic heads. Either way it is rare indeed to see a vintage Rogers drum all original and completely intact. Their high failure rate is a result of terrible design and poor construction.
So you're solutions are, replace and accept the flaws or replace with different lugs.