Any Makin 67/670 owners? Need HELP!

I have one issue. I finally took it out to shoot for the first time BUT i noticed that the metering stayed at - (underexposed) at whatever aperture/ss settings..even at f2.8 and shutter speed of 1" in daylight which is definitely not right. The iso is at 100. But this only occurs when the lens is pulled out. When the lens is collapsed the metering works properly as i can see it go from + to - and vice versa. Is the battery no good? I'm not blocking any part of the camera and the lens cap is off. What could be the reason?
 
possibility on using 220/135 film on Makina 67?

possibility on using 220/135 film on Makina 67?

If the silver shutter prevent sheet is removed from the back, every advance would make the shutter charged and able to fire. By this mod it might be possible to use 220 film on Makina 67? The 135 film might not be possible due to lacking of back paper to make the roller run?
 
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