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So after the initial inspection, watching a ton of video, and gathering tools I'm close to starting resurrecting the Yashica Mat LM. Still have a couple things coming tomorrow that I'll need. As I proceed, I thought it would maybe interesting to others to document as I go.
Day 1 - Removed the top/focus screen. there are 4 tiny screws on the outside rim that hold the top in place. The slot is pretty small, but they weren't difficult. Inside showing the mirror has an accumulation of dust but the interior isn't bad. At the top/right of the mirror is a little black spring clip you have to push down slightly to pull the mirror back and up (be careful it's easy to deform this spring clip or scratch the back of the mirror as you remove it). The mirror is smaller at the bottom than it is at the top so it will lift out once you slide it back a touch. The mirror was of course dusty but not overly bad. It cleaned up nice, I blew out and cleaned the interior, including the focus lens inside (left).
The focus screen was my first BIG mistake. If you look at the photo, it's held in by two spring clips (one top/one bottom) which slide under a small folded over metal tab. The metal tab on the bottom was only holding on by a thread. When I pushed down on the spring clip, the tab gave way completely. So now there's nothing to secure the spring hold down. %^&$%^& . The focus screen is actually two pieces, a top glass with grid lines and Fresnel plate. You have to be gentle with both, but they cleaned up fairly easy. The tab is an issue???? I'm going back to town today to get some Metal Epoxy to try and bond the tab back in place. I don't think I can solder it and hold. If the epoxy fails, if there is enough clearance outside I'll drill a small hole and insert a screw to catch the clip.
Day 1 - Removed the top/focus screen. there are 4 tiny screws on the outside rim that hold the top in place. The slot is pretty small, but they weren't difficult. Inside showing the mirror has an accumulation of dust but the interior isn't bad. At the top/right of the mirror is a little black spring clip you have to push down slightly to pull the mirror back and up (be careful it's easy to deform this spring clip or scratch the back of the mirror as you remove it). The mirror is smaller at the bottom than it is at the top so it will lift out once you slide it back a touch. The mirror was of course dusty but not overly bad. It cleaned up nice, I blew out and cleaned the interior, including the focus lens inside (left).
The focus screen was my first BIG mistake. If you look at the photo, it's held in by two spring clips (one top/one bottom) which slide under a small folded over metal tab. The metal tab on the bottom was only holding on by a thread. When I pushed down on the spring clip, the tab gave way completely. So now there's nothing to secure the spring hold down. %^&$%^& . The focus screen is actually two pieces, a top glass with grid lines and Fresnel plate. You have to be gentle with both, but they cleaned up fairly easy. The tab is an issue???? I'm going back to town today to get some Metal Epoxy to try and bond the tab back in place. I don't think I can solder it and hold. If the epoxy fails, if there is enough clearance outside I'll drill a small hole and insert a screw to catch the clip.