I highly recommend taking a look at the output from this script, https://gist.github.com/ottoteixeira/c5ba96ff296ddf95b36e498654faf871. It's a helper script that generates the calls to claimer.py. I have been successful in claiming both Bitcoin Cash (BCH) and Bitcoin Gold (BTG) using both scripts.

DM me if you have questions.
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Many thanks, i'll have a look