Tim Janz bowled like he was on his favorite house shot in the 2023 MAST Year End Invitational qualifying at Ten Pin Alley in Fitchburg on Saturday. But it wasn’t a house shot — it was Kegel Element Challenge Mercury 4940, a 40-foot pattern with a 38-foot drop brush and 25.545 mL of oil — 13.98 mL forward and 11.565 mL reverse — left-side ratios of 4.91-1 middle-outside track, 1.52-1 middle-middle track and 1-1 middle-inside track, and right-side ratios of 4.82-1...