That was the design 40 years ago.
The point being, there's no such thing as 40 years ago, if GE had any speck of integrity, which they don't, being now only the lowest of bottom dollar whores, thieves & scoundrels in need of the nearest yardarm.
. .where was I?
Oh, yeah, upgrade my boy, always be thinking how to improve the design, esp. when so much money & life is at stake, n'est pas?
Smart folks can reckon how this is cheaper in the long run, short term 'quarter' whores just don't get it.