I bought this TIME Promotional Film Camera at a thrift store and the shutter only closes halfway. I figured out a quick fix if your shutter is slightly jammed.
Fingernail (On your finger)
Step 1: Open Top Cover
Open the top cover of your camera (Should be just two side small screws).
Step 2: Take Spring and Bend It
Take out the spring and use your fingernail or tweezers to bend the spring close the the ends (1/5th length of the spring).
Step 3: Put It Back and You Are Done!
The shortened spring will increase the tension to close the shutter with more power. This small fix has fixed my shutter.