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I don't know what marks are on the DSSA model but I have always checked alignment on my bikes with a couple of straight edges. (In my case some aluminium extrusion left over from a bathroom refit). Lay one either side of the back wheel just touching the tyre and make sure the front wheel sits bang in the middle of them. If not adjust the rear alignment until it does. The bike should be upright and is probably best done on a pit stand.
You can do it with string but it is more fiddly.
You don't have to do this every time. Just check once in a while especially after you have taken the wheel out for tyre changes etc. but make sure when you adjust the chain to turn both adjusters the same amount.
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