Bobbin Case, Singer #359841-900

will try photo tonight, but it will be hard to see the plastic shavings. The PROBLEM with the cage/case and bobbin fit: plastic bobbins get stuck inside the case and grind plastic parts against the metal inside the case. The metal bobbins are tight and for relief, tend to ride up in the case and sometime the crab thread will slip inside the bobbin as it tries to pass over. Could you get me some different bobbins&cases that will freely rotate inside and on the bottom of those cages.?