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How to assemble after replacing electric cable?

I would like advice as the trigger and Spring came out and how to ensure they are fitted OK as the power does switch is not making contact and do it doesn't switch on.I don't appear to have the metal piece is making contact with the contact
Bob, October 2016
Unintelligible - also no make and model

My advice is to watch this video...
https://www.youtube.com/watch?v=iTLIpdi1j28
There other videos

Good Luck..., October 2016