Beckman 2600 15 Turn Counting Dial Helipot Potentiometer Knob 1/4" Shaft

Description

Vintage Used Beckman Instruments 2600 Series Helipot Duodial 15 Turn Counting Knob for 1/4" Shaft.  Often used with 10 Turn Potentiometers.
Counts 0-14 and continues back to Zero if you continue rotation.
Small scale graduated 0-100.
Friction Lock Lever on the side to maintain the setting.
Comes with Black Plastic or Silver Metal Mounting Washer.
Some have one shaft locking screw possibly 2606S others are 2 shaft fixing screw possibly 2607S -Part numbers unverified.
Beckman now apparently TT Electronics current MSRP for 2607S = .20 each.
Removed from salvaged industrial equipment: Scuffs Scratches Oxidation Wear Some knobs have dings and small chips also some locking levers are missing the plastic sleeve cover -will not affect operation.
Note:  1970's era used parts may not have the same smoothness of operation or accuracy of a new dial.
Set screws may be Hex, Bristol Spline or Torx.
Basic cleanup and lubrication performed along with an operational check prior to shipping.