This is the knob used on all the LPL 7700 series (670XL) and all the LPL 4x5 enlargers to control the filters in both the VCCE and colour dichroic lamphouses and filter modules. The knob is secured on the shaft by a small D-shaped spring. If your original knob is broken, this is the correct OEM replacement. Includes the securing clip.
Fits the following: