After digging through piles of wood shavings several times looking for the springs from Baron pens, I decided to change my method. I now open each bag of pen parts over a plastic tray, and pour the contents into the tray. I think this almost eliminates the possibility of a part falling to the floor. I put the plastic bags aside until I am sure all parts are in the tray, and then discard them.
While I realize you did not post that you lost the part, I thought some might benefit from this technique.
It might be helpful to keep the floor clean, too. Just kidding.
Joe