Hi~guys
I want refurbish my old series b,but I got problem when I try to take off the focusing knob.There's a tiny hole on the knob,but it doesn't look like a screw in it. So,is there anybody have clue on this?
Thx~

there are screws on the brass plate und there are srews on the inside of the camera. you will have to remove the lensboard first.

Quote:

I want refurbish my old series b,but I got problem when I try to take off the focusing knob.There's a tiny hole on the knob,but it doesn't look like a screw in it. So,is there anybody have clue on this?

Look closely at the knob 180° from the hole you see, is there a round piece that does not match the texture of the knob? The knob is attached to the focus shaft by a pin, it may be tapered meaning one end is larger than the other. Taper pins only go in and come out one way.
Using a pin punch and a hammer drive the pin out while supporting the knob to prevent bending the focus shaft from the smallest end of the pin if applicable.

I tried to knock the round piece that you mentioned but it didn't move.So,I will try to knock it harder.Thank you~

Put some penetrating oil in the hole and let it sit for a day or two then try again. If you have a hydraulic press it will work better than a hammer and punch.
The knob and focus shaft are brass.

Thanks for your great advise,it helps me a lot~