My father is retired and is in dire need of a certain spring for his old scroll saw. It was made by American Machine & Tool Company in Royersford, PA who now only seems to manufacture pumps. It is a 15" scroll saw Model 4390. The part needed is a spring in the shape of several zigzags about 6 inches long. The original part number in the book is 14708001. Please help if you can. Thanks.