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

Article number: B&Lsec1
Availability: On backorder
Delivery time: Ships in 2-3 Days from our Warehouse

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


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