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do not! however , try to go beyond taking the bottom plate off. if you take the bottom plate off and try to take another peice off , it could be irreversable with current tools at hand
One of the downfalls to do it yourself camera repair is that springs are FUCKING NIGHTMARES to put back on once taken off a camera. And the fact that springs that are old (20+ years) tend to snap if messed with too much.
Taking the bottom plate off will ONLY just give you a view of the internals to some of the camera. So if you look in there and try to move the lever you might get lucky and notice some movement and this will show you where it might be jammed and how to get an the problem. (might just need to be prodded out of the jam manually with a small pointy thing)
Whatever you do , do not go to far unless you are positive you can put it together again.
If you see a spring that needs to be removed i reccomend stopping where you are at and trying to send it off to a pro.