To keep the handle of your pasta machine from falling onto the floor you can use the fingertip of a glove to washer the connection, a set of ultra thin earring magnets or tool grip coating. Or you can interpret the falling handle as a signal to take a stretch break.
Another approach is to let gravity work for you. If you are in an older building and the floor slants, mount your pasta machine on a stool and place the opening to the crank uphill. If the floor is level, placing 1⁄4 inch shims on the front legs of your work table is usually enough enlist gravity and prevent the handle from falling out.
