I would suggest first trying to repeatedly lift-lower arm. Perhaps you aren't using the Table enough? Usually things don't gum up, where they get tighter, and more often, they start to fall, like a tone of bricks.
Perhaps try one very small drop of sewing machine Oil to the Shaft of the Arm Lift, and see if this helps first? Mark
Perhaps try one very small drop of sewing machine Oil to the Shaft of the Arm Lift, and see if this helps first? Mark