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I would suggest contacting Aprovecho who - if they cannot help - may know someone who can.

It may also be worth posting the question on one or two of the stoves discussion lists, e.g. https://listserv.repp.org/mailman/listinfo/stoves_listserv.repp.org

https://www.bioenergylists.org/stoves

and HEDON also run some.

Regards,

Jonathan Rouse