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Rubber wiring sucks. If I know a set has it I tend to think twice about getting it as rewiring an entire radio is a pain...it's uncommon for a large amount of rubber wiring to be used in a 20s set.
If riders isn't helpful look for a Beitmans covering 20s sets. They were a competitor to riders and one of the only second sources of literature for sets that old.
Some 20s sets the wax paper caps used as coupling, bypass and as B+ filters (lytics weren't used much back then) go bad and others they are fine...I don't know that brand well enough to say which it's likely to be. If you have a good leakage current tester you should check the original caps.
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