Hatadi as a company and the switches they sold as a spare part are long gone. A tech will need to adapt one in. I know a couple that would have no trouble doing it, but if you are not in Oz the postage would be more than the price of the conversion. Post what country you are in and someone might be able to suggest a tech local to you.
I can email the documents or send them to a cyberlocker, pm me with an email address. Posting / mailing a paper copy is not practical, we are at a kalgoorlie wa, a gold mine in the middle of the desert in australia.