'Sorry guys, I know there are too many of the same pictures, which is getting confusing. I've already adjusted the 2mm Allen key; it's very flimsy with an Allen wrench, and it only unscrews about 1 revolution. Is that normal? But still, the bike isn't stopping. its at about 50% The pads are clamping onto the rotor, no problem; I think it's contaminated. I'm thinking of buying new brakes from AliExpress, either identical or from another brand, or is that not possible?