mark45831 Posted January 23, 2021 Share Posted January 23, 2021 Do you know if I have to take this completely apart to get to this or how does this come apart, My problem is it works fine, its the indents that wont hold the wheel in place and it easily moves from 1 Asa to another, some of the higher Asa setting do have the indents to hold the wheel. Would like to take a peek inside to see if it just needs a little cleaning or repair. Link to comment Share on other sites More sharing options...
kmac Posted January 23, 2021 Share Posted January 23, 2021 The indent might loosen with lighter fluid dribbled down inside the wheel. The indent could be fouled with gunk. You would need to lay the finder over at an angle after dropping the lighter fluid in to prevent fluid going further into the finder It's hard to know how the wheel could be dismantled but the silver "hub" may be a screw that screws out. If it has index marks on it, they would have to correctly aligned when the screw is replaced. I'm only guessing about all this because I can find nothing in search results about disassembly. It's just food for thought. Link to comment Share on other sites More sharing options...
mark45831 Posted January 23, 2021 Author Share Posted January 23, 2021 The indent might loosen with lighter fluid dribbled down inside the wheel. The indent could be fouled with gunk. You would need to lay the finder over at an angle after dropping the lighter fluid in to prevent fluid going further into the finder It's hard to know how the wheel could be dismantled but the silver "hub" may be a screw that screws out. If it has index marks on it, they would have to correctly aligned when the screw is replaced. I'm only guessing about all this because I can find nothing in search results about disassembly. It's just food for thought. me either, been looking for some time now, even in the repair groups on FB had no answer, I will try the fluid, thanks Link to comment Share on other sites More sharing options...
AlanKlein Posted January 23, 2021 Share Posted January 23, 2021 Maybe you can get the assembly info here. Mamiya RB67 repair manuals instruction manual, user manual, PDF manual, free manuals Here's the op manual I believe. https://www.cameramanuals.org/mamiya_pdf/mamiya_rz67_pro_ae_prism_finder.pdf Flickr gallery: https://www.flickr.com/photos/alanklein2000/albums Link to comment Share on other sites More sharing options...
mark45831 Posted January 23, 2021 Author Share Posted January 23, 2021 Maybe you can get the assembly info here. Mamiya RB67 repair manuals instruction manual, user manual, PDF manual, free manuals Here's the op manual I believe. https://www.cameramanuals.org/mamiya_pdf/mamiya_rz67_pro_ae_prism_finder.pdf thanks but mines for the RB67 Link to comment Share on other sites More sharing options...
mark45831 Posted January 23, 2021 Author Share Posted January 23, 2021 It does come apart by turning the chrome knob counter clockwise, was a easier fix than I thought, its just simple tangs that where bunt up where the pin was not fitting between the tangs, I just simply flatten the tangs back , and all works great now. I was half expecting a spring to shoot out and parts fly every where! lol 3 Link to comment Share on other sites More sharing options...
orsetto Posted January 23, 2021 Share Posted January 23, 2021 Congrats on the repair! :) I figured that silver knob must unscrew somehow, but couldn't find my disused TLR porrofinder to verify. For future reference, its may be useful to note here that Mamiya employed essentially the same control dial in multiple contemporary CdS finders: this RB prism, the RB CdS Rigid/Mag Hood, the TLR CdS Porrofinder and TLR CdS Rigid/Mag Hood. Link to comment Share on other sites More sharing options...
kmac Posted January 23, 2021 Share Posted January 23, 2021 Great job, glad the screw came out for you. Some lubrication on the underside of the tangs and indent pin plus it's spring would help with the longevity of the dial unit. Perhaps a smear of lithium grease. Link to comment Share on other sites More sharing options...
AlanKlein Posted January 24, 2021 Share Posted January 24, 2021 Glad you got it fixed. Flickr gallery: https://www.flickr.com/photos/alanklein2000/albums Link to comment Share on other sites More sharing options...
mark45831 Posted January 24, 2021 Author Share Posted January 24, 2021 Great job, glad the screw came out for you. Some lubrication on the underside of the tangs and indent pin plus it's spring would help with the longevity of the dial unit. Perhaps a smear of lithium grease. it has a spring under the plate and under the knob. Link to comment Share on other sites More sharing options...
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