Those fuses are still in the Cooper Bussman catalog.
http://www1.cooperbussmann.com/pdf/04a56af6-62e3-41ce-a20d-ef0beae33d14.pdf
I have 2 1/2 amp fuses in both Model 15 machines,
and I've added either a 3A fuse or a 3A breaker to
the Model 14 machines. None of them have ever
blown.
John Nagle