Wetter numbering machine is stuck

Any suggestions for loosening up a wetter numbering machine? I’m guessing it is just a bit rusted, but the numbers will not move when button is depressed. Thoughts?

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Waldos and Company, Marinate the said machine, in mineral sprits, kerosene, over night, baste in the morning. retrieve machine & machine oil plunger and shaft. Depending on the machine you can depress the “0” cipher and oil the shaft that way. best james

We stored our numbering machines in a glass jar with gasoline. We used a 6pt wood reglet to depress the “0”s; however not all numbering machines have depress-able “0”s.
Be careful with excess oil as oil adversely affects inking.