Greg_E said:
Why a secret? I like TLRs, and waist level finders on my other cameras. No secrets here.
I prefer to use a magnifying hood chimney on the viewfinder. Usual folding WL viewfinders have difficulty in composing and focusing well outdoors, unless the viewfinder is shaded nearly completely. The easiest way to do so is to put the face right on the finder with magnifier poped up. So I just use the chimney with 3.5x (1e1g, most likely, coated) and 6x (3e3g, most likely, coated) magnifier (switchable) with my Mamiya C3, at 3.5x mode, almost always. With the chimney, I have to put my eye on it, but practically speaking this is exactly how you must use regular WLVF outdoors anyway, so in effect I lose nothing.
I also carry this setup on a monopod, either Benbo Trekker or Manfrotto 3016.
The quality of magnifier glass is superior on this chimney (sharp to corners) than the one on folding WLVF, and of course there is no stray light so I get very clear image on the screen, which is very easy to work with.
Like many others have said, that meter is probably gone by now. The cell does age, so unless you want to spend a bunch of money getting it replaced, just use a handheld meter.
Yashica MAT 12/24/124/124g use CdS photoresistors and simple circuitry so the cell doesn't go bad like selenium photocells. More of a problem is that the built-in meter sucks, since you just have to find a correct exposure first and then shift to desired aperture or shutter speed therefrom. With a L-208 or other meters you can get all combinations at a glance. Another reason why I carry heavy Mamiya beast is that I want better optics than Tessar (and I can't afford a Rolleiflex).