I suspect, that, had I checked them as I have often not done, prior to each flight, I would still have my plane in tact as Im sure all hinges that failed surely didnt fail all at once, so, we may deduce pilot error due to poor preflight inspection of aircraft.
That said, I must tell you that not only were the ca hinges reccommended for the 120 size plane, they actually came with the kit along with specific installation instructions which were not only followed, but, improvised on to prevent such a misshap.
Prior to sat., I couldnt be persueded not to use the ca hinges, now, Im determined to never use them again.
I havnt tried any other type hinges, though HOOTER, who also flies at the same club, uses the Dubro hinges with dowel reinforcment and has never had an aircraft failure, other than dead stick, so, I purchased the same and will install those before next flight.
I used to think, the simpler the better. The ca's had no pins or working parts to fail, so, thats what I went with untill this happened.
Live and learn, die and forget it all.