The brands of Ebonite International have signed a couple of PBA Tour champions to their ball staffs for 2017, EBI announced Sunday. Ronnie Russell, who has been with MOTIV, has signed with Ebonite, and Jakob Butturff, who has been with 900 Global, has signed with Columbia 300, according to news releases from EBI. Russell, a 37-year-old Indiana right-hander who is a member of Team USA and earned gold medals in doubles and team in the 2016 PABCON Championships, has four PBA Tour titles. "I...