Good point. I'm gonna' tear it down for a better look.You got me wondering, so I just checked all mine with a good whack to try and break them open.
Years are 1956, '59, '68-69, late 70's, and a 1980. That's five HW35's and none broke open when tested.
Yours doesn't look like it's been overly used, so maybe there's rust or crud in the groove impeding a solid lock.
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