My brother's exgirlfriend sold her house, so access to that floor isn't available (at the moment), if it was ever fixed. I'll inquire, further.
Additionally, I spoke to an oldtimer, still in business, who said packing floor gaps with jute, or similar, is rarely done anymore. He recalled packing floor gaps with plumbers waxed cording, the stuff plumbers used on cast iron piping. I remarked, that sounded similar to what was used to pack boat shaft boxing, long ago. He said it was the same stuff. He didn't recall the name of that packing and I don't know, either. As for as using a waxed cording, long ago, I'm sure floor finishing/refinishing techniques, if any in some of those cases, were different than now, allowing for the waxed cording in some cases.
Sonny