Bob's Knobs for B&L (Criterion) 4000 Secondary

Article number: B&Lsec1
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Knobs for B&L (Criterion) 4000 Secondary


Part: B&Lsec1
Fits: Bausch & Lomb 4000 series

Knobs: Black plastic, 9.5 mm (3/8”) diameter
Threads: Stainless steel

Notes:

  1. The factory dust cover will fit properly with Bob’s Knobs installed.
  2. This secondary has a central screw
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