Besides being of questionable design, after almost 100 years of use, we are seeing more and more cases of this arm failing due to metal fatigue these days. I have replaced three in the last year alone! Old-timers in the hobby can attest that this wasn't a major problem 20-25 years ago and has increased in frequency since then. The new repo arm is much stronger, although the staking pin area will always be the Achilles heel. Too bad that you'll probably have to replace the new arm again in another hundred years.
M.