The old images of top plate removal in that thread are gone long time ago. As I had to work inside the top plate on my HRF, I will post new images
for the venue.
My sequence suggestion for your work under the hood:
1) remove the front screw under the leatherette
- remove the front screw under the leatherette
- remove the other three top plate screws
- remove the ISO dial pin hole screw
- do whatever is required
- start reassembling with the ISO dial pin hole screw
- screw in the four top plate screws
As you can see, the 4th screw is - looking to the front of the camera - exactly a few mm below the left corner of the viewfinder window and left of the frame line lever. It is enough peeling gently a little bit of the leatherette to access this screw.
All four screws are very small. And: They are not the exactly same lenght. The screw under the leatherette is the shorter one. Keep it in mind for reassembling.
2) remove the other three top plate screws
3) remove the ISO dial pin hole screw
There are many suggestions in the web how to release the ISO dial screw. After trying different DIY ways to release this last 5th screw (scratching the black top finish
) I gave nearly up. But a week later I found a standard tool which fits exactly these holes and gives you a firm grip.
(This tool is normally used to handle o-rings)
After disassembling the ISO dial, be careful not messing up the ISO contacts. Completely dismantled it can fall apart in four pieces, but it is not required you disassemble this dial if you aim only at the rangefinder in yards. Here you see from left to right:
- The ISO dial tray with the numbered ISO selector still in
- The exposure compensation +/- dial
- The ISO screw
If you have to do some work at the on/off switch, the shutter release or the time dial, the flash socket, the windows or the eyepiece: It's all here in the top plate.
4) do whatever work is required
Most revision activities are related to the rangefinder light paths, which are now open in front of you.
5) start reassembling with the ISO dial pin hole screw
When you start reassembling the top plate, mount the ISO dial mechanism first and screw in place the ISO screw. Before mounting the four small body screws check the correct mechanic stops of the ISO selector and the exposure compensation +/- dial. If both functions seems to click and stop properly, check it against the shutter speed information in the viewfinder, because it is possible reassembling a completely dismantled ISO dial mechanism with a wrong starting angle.
6) screw in the four top plate screws
After this final shutter speed test fasten the smaller screw in the front hole and then the other three screws in the remaining threaded holes.
Your are finished.
Needfull things for top plate removal:
- Sharp micro screw driver to peel off the leatherette
- Phillips X screw driver #0 for the four top plate screws
- O-Ring pliers for the ISO dial 2-hole screw (pins have to be smaller than 1 mm diameter)