A now expired listing on Ebay seems to indicate that 'Mako' ticket stampers used a roll of (red coloured?) ink ribbon which, assuming you had a spare one, was capable of being replaced by removing the two side screws on the side and removing the cover plate(s).
If the original ribbon is still in the machine you've acquired, it
might just be possible to replicate your own replacement ribbon with a length of typewriter ribbon. Likely to be a messy job, though!