Based on what was seen in two PBA Regionals and one PBA50 Regional this year, it should come as no surprise that PBA has ruled QubicaAMF Edge USBC-certified string pinsetters “acceptable for professional-level competition.” I wrote this lengthy story on the PBA50 Regional on the machines in Florida in May, which saw Walter Ray Williams Jr. beat Ryan Shafer in the title match. The story includes links to many of my stories on string pinsetters as they have gone from carnival to...