I had a Canon FTb come in today and decided to test it out.
When firing off a some shots, I felt the faster shutter speeds were accurate; however, I noticed that anything 1/4s or slower was noticeably off especially 1s where the curtain will remain open almost as if it is in bulb mode.
Interestingly enough, if I shake the camera while the curtain is open, you'll hear the little mechanical spring and gears turn and shut much faster than compared to leaving it alone.
So my question is: Can this be self-repaired and is it worth the effort? Also, will the inaccurate shutter speeds continue to grow worse (as in will I soon lose 1/125 or faster)?