I will attempt to change my Hasselblad 500c screen myself and replace an A12 film back's internal light seals

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Its about the light

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I will attempt to change my Hasselblad 500c screen myself over the next couple months and change the internal light seals - not the dark slide light seals - on an A12 film back (see here for context). I'm leaving up this thread as progress log.

Would it be wiser to send this off to professional? Yes. However, so far, I feel I've seen enough evidence that each is doable. I'll stop and send everything to a professional once something looks dangerous.

Wish me luck. Please share your tips if you've already done this successfully. I have a few questions I have to research:

For the screen
1. What's the part number for the 500c screen's screws? I may try to buy an extra set before starting.
2. What's the part number for any other relevant 500c screen parts? Ditto.
3. Where's an 'official' exploded diagram of the screen and installation instructions?
4. What exact screwdriver type and size should I use to match the screws?
5. What chemicals or lubricants should I have on hand, if any?
6. How do I get a broken screw out if God frowns on me when I try this?
7. Can I re-calibrate focus with a 100mm lens or should I order a 250mm to make it easier?
8. Is there a step by step video out there with helpful viewing angles?

For the A12 film back
1. See questions 1. - 5. above.
2. See question 8. above.

My successful DIY builds and repairs so far
Sputnik stereo camera lens focus calibration
Mamiya RB67 Instax Mini film back build
Mamiya RB67 lens PC sync port replacement
Mamiya RB67 light seals replacement on rotating film back and 120 film back
Yashica 635 Olsen screen installation and focus calibration with shims (2x)
Leica M3 vertical rangefinder adjustment
Leica M2 vertical rangefinder adjustment
Nikon FM focusing screen clean (slight disassembly required)
Nikon FM light seals replacement


Past Photo threads on 500c screen replacement






Past Photrio threads on Hasselblad A12 internal light seal replacement

 
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