The package will have 3-4 different thicknesses. Because of the small degrees of difference, they're also sized (diameter) different. So small diameter thin = 0.0x inch, small diameter thick = 0.0y inch, large diameter thin = 0.xx inch, etc....should say on the baggie.
There are good tutorials (mechbox.com, dedalus devgru something,...). Once you learn the theory of what you're doing...you have to learn the feel of it. What's tight enough, what's too tight.
Because of the variances with manufactures and their quality control...it's not always correct to say..."put a 0.02 under the bevel and a 0.03 on top of the spur..."
Best of luck.
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