Hi,
There is actually no direct way of destroying a metafont, the run-time engine mantains a table of the the created metafonts and the clean-up is done when the CVIRTE is unloaded.
However you can change the font parameters on the fly by calling CreateMetafont twice with the same metafont name. This way you can reuse the space allready alocated.
Hope that helps.
Regards,
Juan Carlos
N.I.