Bronica ETRS missing lens lock knob

[bobsteele]

I recently bought an extremely nice Bronica ETRS with the AE II finder, three film magazines, a winder, and three lenses from an auction site. The only problem is that the knob to unlock the the lens locking mechanism is missing. Can anyone recommend a source for this part, or have suggestions for a work around so I can change lenses? TIA.

 

[bobsteele]

Following on to my original post, here is a picture of the post where the lens release knob is s
upposed to be. Again, any help or suggestions are much appreciated.

 

[wiltw]

The missing piece may be nothing but an aesthetic button to improve comfort in pressing in the button to release the lens.

Have you tried to push in on the post itself, to release the lens?

Notes:

1. The shutter must be cocked, before you attempt to mount/remove a lens.
2. Rotate the lens release button 45 degrees clockwise to depress the button
3. Unlock the lens with a clockwise rotation of the lens.
4. The lens release button will automatically resume the 'Lock' position when pressure is released from the button