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Amusingly, it’s also fairly accepted practice with bike shops that if you provide the materials yourself the labour actually costs extra!
Also correct, some do, some don’t, I just says we can’t offer guarantee/warranty as it was not purchased from us.
E.g. chain provided by customer snapped due to its being faulty, no warranty, pony up for a new one.
Otherwise be happy to replace the chain on the spot and send the faulty one back to the supplier/get credit if purchase from us.
Business acquires materials, combines them with labour, total cost of job is labour plus materials plus a premium on those materials.
That quite comfortably describes both a bike shop and the operation of a tradesperson we’re talking about.
Amusingly, it’s also fairly accepted practice with bike shops that if you provide the materials yourself the labour actually costs extra!