Strong reply right there.I've never had this issue on Superstar or Imperialstar 1980's drums....and I've owned about 50 drums total. Over tightening the lug screws and/or tension rods can play a role. It's also more likely to pop a lug tower if you don't release all of the tension on it before loosening a lug screw.....did that once by mistake. A friend of mine recently bought a set of Imperialstars where half the bass drum lugs were replaced with rockstar lugs. After going through the kit a couple of other lugs were found to be cracked or damaged. Same comment for some of the wing bolts and nuts on the stands. We finally figured out that the seller had "hands of steel" and over-tightened everything to the max, even lugs. No fastener was given a pass.....lol. And in the process he broke a LOT of lugs on his kit. Reminded me of guys at the old power plant who could tighten valves with just a quick snap of their hands....and the rest of us would need valve wrenches to move them the next time.
These pot metal lugs do tend to see white/green corrosion if left in humid environments for many years. But you still have to put a lot of stress on them to snap them. On kits showing excessive white/green precipitate on the screws or lug interiors, soak them in vinegar for 10-20 min, rinse down with Windex, dry, then lightly wipe the interiors with oil. Another option would be to clear coat the interiors once done cleaning and neutralizing them.
Best source for the lugs if you want to do a complete swap is to buy a cheap Imperialstar tom, especially power toms that are often sold quite cheap. On a 14 or 15 inch power tom you get 16 lugs, and all the other parts too. Parted out, a nice one of those drums can fetch $100-$125.....yet one can routinely buy those drums for $50-$85 each.
From centre to centre, seems to be 1 1/2".What's the hole spacing?