the hi-matic hybrid

[alinCiortea]

i've just bought a hi-matic 7s to replace a hi-matic 9 i bought broken some time ago. the seller said he didn't know much about it so i hoped it was ok. the lens is wobbly and there's a rattling sound coming from the lens (i suspect a loose screw, that would explain the wobbliness too). the shutter works and seems accurate, but the meter has a mind of its own. if i hold the camera horizontally it won't move from its up position but if i turn it sideways it goes about half the scale. initially i thought it actually gave me a light reading but it seems the needle moves to some extent while the camera is held that way even if i remove the battery. nevertheless it did give some slight signs that there's current going through the meter. for the moment i'll call it a 'incapacitated' meter.

the hi-matic 9 had a good meter but a dead shutter (also seemed to miss some components from the shutter assembly from a previous 'repair guy'.
my question is can i transplant the lens from the 7s to the body of the 9? (assuming the metering issue is not cds-cell related) (the 9 also has a much crispier focusing patch)

 

[alinCiortea]

i've fixed the wobbliness. the 'shutter plate cage' (i don't know what it's called) was loose because the previous guy who attempted surgery on this camera only replaced two of the three screws keeping it in place and also used a wrong screw. the rattling sound was the shutter speed ring's click stop piece floating around the barrel. there's still a small amount of looseness of the lens but i believe it can only be fixed by taking the whole lens down and accessing it from the behind.

i've taken of the bottom plate and a little squarish brass piece fell out. i have no idea where it came from but it has rosin on it but no soldering tin marks... funny enough, the light meter started working after this but it overexposes by around three stops. i've noticed three calibration pots (?) on the light meter assembly. how can i calibrate my meter? and why is it overexposing so badly? (the light meter reacts to both changes in lighting and changing of iso setting)