Hello members …I have a DLX64 Carburettor on my 1929 Indian 101 Scout. The jet is seized in situ.  I have ultrasonically cleaned the carb on a number of cycles and the jet is still stuck.  Perhaps it may need a few more cycles to free it.  

I know some DLX64 fabrications were brass and others were white metal and to free the jet, from a white metal body carb, is more difficult.

White metal has a tendency to harden with age.  

Are there any techniques which members have successfully used to free jets.

Thanks members …Phil Jenner’s response to this has worked very effectively.  I was surprised as to just how effective Phil’s technique was.  Thanks Phil Jenner.