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where can I purchase Stanna 420, two carbon brush assembly?

Where can I purchase Stanna 420, Carbon Brush Assembly in USA?
DON, June 2017
Contact suppliers of the stairlift and ask them where spare parts might be found.

Alternatively...

Use an internet search engine like Google and enter a search phrase like - Stanna Spares

Good Luck..., June 2017
link Click here to see other fixes for 420.