On the bright side you only have to replace the bad one. I wouldn't try to reinvent the wheel here. Do the same mod and hopefully it lasts another 30 years

Is that even..

I'd be looking at someone's hide. A big one.

When googling - I found this text from the mfr:
The BQC style breaker has a common trip as well as a rejection tab feature. These breakers are designed for use in BR type load centers and should be installed only in panel positions that have notched bus stabs that accommodate the rejection clip.

Seems to me your stabs are not notched?


https://www.dkhardware.com/br-1-50-amp-2-pole-and-2-20-amp-1-pole-bqc-common-trip-quad-circuit-breaker-bqc2502120-product-3141978.html?utm_source=google&utm_medium=shopping &utm_campaign=free_listings&gclid=Cj0KCQjwxIOXBhCr ARIsAL1QFCaDzQkNbeiDUlt0DxrAVJpbkEAkZ3CH6pEYLUfnQh TPnxqCSZtaG9EaAnrCEALw_wcB

Seems like they are notched. http://forums.pelicanparts.com/uploa...1658959994.jpg
But what do I know.

Notches are probably at the bottom where double ones are supposed to go. The rejection tabs (if those have them) are to keep you from doing just what they did...put more circuits in the box than it was designed for. It is really not an unheard-of practice to do this to make them fit (as in your box). If an inspector noted it on a house sale, you might have to fix (might not meet code in some places).