Original era springs
With housing across this area built mostly between 1943 and 2002, and a big share of it dating to the 1960s and 70s, a lot of these springs are original or close to it. A spring rated for roughly 10,000 cycles doesn't care what decade it is - it just counts openings and closings, and a 50-year-old door has used up every one of them and then some.
