Dammit !!!!!!

[sprocket]

So i've been reading the forums for most of the day to get my head around some general maintenance, did a quick check over the bike and saw the chain was slacker than an otargo uni student, so i figured ill give it a go and ajust the chain, so I proceed to loosen the main bolts and then start to adjust the rear wheel out, next I go to align the the wheel checking my marks to discover that they are only on one side?? after about ten mins of head scratching I look on the inside of the adjuster block, and to my surprise its been install back the front with the markings on the inside Dammit!!!! what sort of dumbass does that? so me being a novice bike mechanic have the task of take the wheel off to turn the adjustment block around, i have tried to measure on the same points of the swing arm to try and alighn but im not convinced that it totaly right

advice

[98tls]

real easy to slide axle out and turn block around....another way is to back it right off and then tighten counting the turns as you go...make sure you do the same number each side.