However, in this case, it is actually reasonable to deduct 600 yuan from the new model.

For more than 9000 items, this deduction amount is not high.

After all, I have worn it for a while, and there is a depreciation charge for replacing it.

As for the quality of the product itself, I didn't see it clearly when I bought it, or I made surface optimization before I sold it. This point must be clarified. Now the deepest part of the water is surface optimization, and the appraisal certificate is genuine, but surface optimization will make the sale look good, and problems will be exposed after a while. This situation is sometimes unclear to merchants, that is, the industrial chain.

Upstream things

Normal mandrel

Good luck!