lpi for G grades can vary from 18 to 22 depending on the gun and the era it was made. Earlier guns are generally finer. Than the later ones. And you will find that the actual spacing on original guns may not truly be an even spacing since the tools were hand made.
There is no tool specifically for doing the proper borders.
Getting checkering tools these days in tough. The common companies (dembart and gunline) are going out of business and getting cutters from them is difficult. Starter sets from them though are readily available through many sources.
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B. Dudley
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