I use that method with a slight modification. I drilled two 1/4" holes in the conduit and used some all-thread to hold the conduit to the rear wheel. I put some 1/4" rubber tubing over the all thread so it wouldn't scratch the wheel. It works great even single handed.
You don't. But sans high tech equipment you have to assume something is straight and go from there. Probably better the front wheel than the swing arm piviot. If the rear wheel is aligned to track behind the front wheel and the chain is not centered on the rear sprocket something is probably bent.
If you read the article closely, it tells you to move the front wheel left or right until it is parallel with the conduit--then all you need to do is adjust the rear wheel until the conduit is the same distance away from the front wheel on each side.
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