Yeah, you need to get the right step-down for the ferrule. The gear cable will usually take an end cap first, and I think a plastic end cap will usually add up to ~5mm. You may need to measure the braze-on's internal diameter though.
http://www.sjscycles.co.uk/stepped-chrome-ferrules-37-mm-insert-for-5-mm-gear-outer-pack-of-4-prod5267/
@rodabod started
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Yeah, you need to get the right step-down for the ferrule. The gear cable will usually take an end cap first, and I think a plastic end cap will usually add up to ~5mm. You may need to measure the braze-on's internal diameter though.
http://www.sjscycles.co.uk/stepped-chrome-ferrules-37-mm-insert-for-5-mm-gear-outer-pack-of-4-prod5267/