MarkWalberg
Established
Leaf shutter cameras have a front and back housing for the shutter, to hold the front and back together, there is often a little bolt or nut with a side cut off, like a half moon sort of. With two holes to turn it. Turning it one way locks the front and back together. turning it another way lets them come apart. What is this part called ???
I popped one off one of my Konicas. Bummer. Can I replace or fix this?
I popped one off one of my Konicas. Bummer. Can I replace or fix this?
raydm6
Yay! Cameras! 🙈🙉🙊┌( ಠ_ಠ)┘ [◉"]
Maybe an eccentric retaining cam? Or, semi-circular locking cam? See page 4 (B.1.): https://learncamerarepair.com/downlo...t-1936-CLA.pdf
There are also some leaf-shutter exploded-view drawings on this web site that might help: https://learncamerarepair.com/index.php
There are also some leaf-shutter exploded-view drawings on this web site that might help: https://learncamerarepair.com/index.php
I've always called them a retaining ring, same as on a lens.
OlivierAOP
medium format
I've heard it called locking or lock screw.
BernardL
Well-known
That front ring is not something you open every day. Do what you have to do inside the shutter, make double sure it works, and secure the ring with a drop of nail polish or similar semi-permanent glue, just where the "bolt" used to be. Not cyanoacrylate.
OlivierAOP
medium format
That's a good idea. The screw is just there to prevent the retaining ring to spin. The ring itself isn't super tight: it applies enough pressure for the speed setting ring to move but not be loose.
murrayatuptown
Established
I'd call it a modified screw head, if you mean something like a D-shape instead of a full round head shape. I see them in combination with a 'fluted' retaining ring that's tightened to a desired position (rather than brute force tightness), then the D-shape head (which often has two holes or dimples to allow slight rotating into position that prevents the fluted ring from moving). It seems British call many wrenches 'spanners' but in US English a spanner seems to more commonly refer to a 2-point wrench. You can use stiff sharp-point tweezers lacking a proper tool.
I have also seen such hardware in lenses that have set screws to set the infinity focus registration (like old D- or C-mount) lenses.
But lacking a proper replacement screw with the altered head, it seems you either have to find a parts lens (slim chance, and possibly wasteful), or what Bernard & Olivier said...use an alternative anti-rotation means.
If you 'popped one off', sounds like you lost the screw head, not just one corner of the flatted portion. If I lost the entire screw head, I would choose some kind of rigid adhesive, and clean any lubricant, if present, from the area you want adhesive to stick. Nail polish is good, and easier to find than specialty adhesives made as anti-tampering indicators. Use a pin, needle or dental pick to apply as small a drop of it as you can manage. I have used epoxy, waiting until it is getting to the end of its working time (stiff enough to not run into other places it will cause problems, but still pliable enough you can transfer some). I've also used solvent-based glues like "Goop" that get pretty hard but peel off or dissolve with solvent later if needed. Hot glue might not be tough enough.
I have also seen such hardware in lenses that have set screws to set the infinity focus registration (like old D- or C-mount) lenses.
But lacking a proper replacement screw with the altered head, it seems you either have to find a parts lens (slim chance, and possibly wasteful), or what Bernard & Olivier said...use an alternative anti-rotation means.
If you 'popped one off', sounds like you lost the screw head, not just one corner of the flatted portion. If I lost the entire screw head, I would choose some kind of rigid adhesive, and clean any lubricant, if present, from the area you want adhesive to stick. Nail polish is good, and easier to find than specialty adhesives made as anti-tampering indicators. Use a pin, needle or dental pick to apply as small a drop of it as you can manage. I have used epoxy, waiting until it is getting to the end of its working time (stiff enough to not run into other places it will cause problems, but still pliable enough you can transfer some). I've also used solvent-based glues like "Goop" that get pretty hard but peel off or dissolve with solvent later if needed. Hot glue might not be tough enough.