If there are no receipts for the parts, then they are cheap chinesium.
Do not buy it for the parts without the proof that they are good.
Yes, I saw the assembly line on the cam there, or at least that's what I thought it was in the pic.
Buy a core, and buy good parts new, or here. If you have to save up over a year for all you need, what is your loss? What is your
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Worth?