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[QUOTE="jaguar, post: 661169, member: 19340"]
I forgot to mention that you have to first take off the chain.
I tried to use the laser pointing such that it just grazed the side of the rear sprocket but that didn't work out. So then I wanted to have a way to point the light beam above the rear sprocket and align it by sight. But unless the light is hitting something (and therefore sending off some reflection) you can't see it. So then I came up with the clear plastic idea. Important also is head position. Close one eye and situate your head above and to the rear of the rear spocket. Move left or right until your eye can't see any of the side of the rear sprocket. Move vertically until you can see the two points of light (reflecting from the close side and the far side of the plastic) and the sprocket under them so that it will be obvious how to move the light to get it more in line with the sprocket.
Another way would be using smoke. Have a buddy blow smoke above the rear sprocket while you get the light in alignment with the rear sprocket.
Any true straight edge would work also but would it be as true as light? NO
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