Re: Chain adjustment advice.
As Toejam said, the markers are plenty good. Especially if you're just riding on the street or doing track days. You can use the string method or purchase a laser type alignment tool if you want it more precise, but personally I wouldn't worry about it to that degree unless you're racing. More important then making sure that is dead on like a gnat's ass is to make sure your chain slack is set properly and you clean/lube your chain regularly.