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Message: [QUOTE="jaguar, post: 661886, member: 19340"] Robcolo, the front sprocket is a no-go since it isn't secured tightly to the drive shaft. Its wobbly on it. Also theres no space in front of it for the body of the light pen. Jaybird, how do you know what will or won't work unless you try it? I'm not knocking the straighedge method. It's just that I came across this light pen before I came across something long/straight/non-bending that I could use. The main point here is that the snail adjusters and even measuring the distance are not fully accurate methods and if someone wants their chain to last the longest possible then maintaining the sprockets in alignment is also necessary. [/QUOTE]