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^ This. A mate has snapped 3 chains in the past 2 years, all installed by different trained mechanics but purchased from Amazon and random stores on eBay, while chains purchased from wiggle and me have been fine. That’s not a hassle I want my business involved in just to save a customer a tenner.
I’ve barred Amazon and random eBay chains. If an established customer would like to bring a chain in, they’ll have to email a copy of their receipt for it and acknowledge an email highlighting the dangers of possible counterfeit chains.
There's also being liable for fitting parts you don't know are legit.