Actually, BG doesn't use these aids. It is normal for vendors of all sorts to surround the putting green at each PGA TOUR event, hoping to get players interested in using their products and to secure their endorsement. Such was the case here.
Brian hit six putts (from six feet) that rolled down the 'rail' and then the remaining three feet to the bottom of the hole. Whereupon followed this exchange:
Vendor (clearly awed): I've been out here all day, and nobody's done that.
BG: Smiles, but says nothing, turns and begins lagging 20-footers.