It was me who posted the original idea. This is the post Alignment guide
Thinking about what @dlang is saying I have revised the design to have two pin positions so you can hang two ‘plumb bobs’ off a short center pin and a longer top pin, thus when the string’s align you have top tooth vertical. The pin can be anything you have to hand (cocktail sticks or matchsticks?) drill holes to fit them.
Here is one I have just printed to test the fit, I needed to adjust the size of the cog hole to fit tightly on the supplied cog. I have updated the thingiverse model.
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