You are reading a single comment by @M_V and its replies.
Click here to read the full conversation.
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
@M_V
The aperture blades weren't too bad actually.
I tried going in through the back but could shift some of the screws so I went in from the front. I pried up the ring that has Mamiya - Sekor 80mm etc on it with the edge of a knife, it's plastic and just stuck down with double sided tape. You'll then be able to see some screws, I think the first ones you see hold on a bit of the lens barrel then once you remove that you'll see the ones that hold the front element in. There's a few sizes of screw so make sure to keep the screws with the parts they belong to. Once you get the front element out the way there should be a plate that fits into a groove a bit like a big circlip. This acts on the aperture blades and it'll have a spring that pulls the aperture shut, you can play with it and get a good idea of how it works. Unclip the spring and undo the plate from the groove and lift it out and the aperture blades are right there. I used tweezers to lift them out and a scrap of t shirt material to clean them. They will only fit in one way but you could always take a snap of them on your phone of something so you can check the order they go back in in.
It sounds complicated but honestly, once you get into it it's pretty straight forward.