Ken Duffield slammed a perfect game in an 836 series and Leann Butts blasted a 728 to highlight area bowling on Tuesday. Both series came in the Ten Pin Alley Fifth Quarter League and Duffield's 836 broke the record for the Fitchburg center that opened in 2003, assistant manager Chris Pounders reported. Duffield sandwiched his 300 — he has many in his career, but I don't have the exact amount...