Terminals are cleaned originals, easily done using 50mm rotary wire brush. No need to pry open the crimped tabs to remove them, just apply flame to the old insulation strip. It's made of fibrous material which crumbles away when burnt, releasing the terminals. The crimped tabs can then be opened easily for re-use.
One slight problem is elongation caused by re-crimping, which alters the finished length and terminal spacing. Solution may be to punch holes slightly closer initially. Once I've perfected this I'll make up a quantity of blanks which can be sent by mail.
