We offer two products to repair the frequent corrossion on the battery contacts. The most frequently sold is the complete assembly - it is ready to be put in the HP41c calculators as it comes. This is the version we recommend to our customers.
However, some of them are more adventurous or more daring, and that decide to go the extra mile and assemble it themselves. for them we have the naked Flex circuit.
However, I'd like to give some comments from my experience of assembling more than 60 units myself:
And you're done!