From Jim Swank Classic Nib brings you one more beer type blank. Jim takes bottle caps.cuts the sides off, wraps them around a tube and then casts in a poly resin. All single tube blanks that have two caps are for the Sierra Vista only, all Sierra blanks with only one cap centered are for either the Sierra Vista or the normal Sierra style component. Here is an Example of the single cap on a Normal Serria Style component called the Arrow:
