BTW, in mine, the blades are blued steel.
I have one on a 1936 Speed Graphic, the aperture blades are lacquered paper.
View attachment 255662
1. set the selector to T then remove the center screw, then lift the dial off the shutter.
2. remove the 3 screws on the cocking lever then remove the lever.
3. remove the screw then Carefully lift the speed dial off the shutter paying closely to the order the underlaying parts are in. They may be stuck together.
4. turn the shutter over and remove the 4 screws around the perimeter of the case. Note that they are not equal distance from each other.
5. lift the case with aperture off the shutter mechanism.
6. take pictures, disassemble, clean, lube as needed, reassemble.
The aperture operating lever may have a thin layer of grease on it, clean and relube. Do not get any grease or fluids on the aperture blades. I rubbed extra fine powdered graphite into mine with a cotton swab. It works smoothly.
If you search, there's a wiki page with a list of compur serial numbers by year (number is usually on the side of the shutter).
My particular dial-set (1914) is metal for both sets of blades.
View attachment 255665 View attachment 255666
1925, definately paper aperture blades.
http://camera-wiki.org/wiki/Compur_serial_numbers
You will find a pin or two on the bottom of the dial parts that engage levers through slots and the pieces only mount one way so the speed is not important. I usually use 1 second.Is there any particular speed I should leave the speed dial on? And, anything I should look out for for why the slow speeds are not engaging, or just clean & lube and go from there?
I have one on a 1936 Speed Graphic, the aperture blades are lacquered paper.
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