By C. Wilkerson
Past President M. W. A. of Colorado
One of the objects of the experiment was to determine a method that would preserve insofar as possible, the original thickness of the metal at the holes, and as a result, I adopted and used for this work, a flat faced punch with small hole.
My method of procedure is as follows:
First, before taking movement apart, oil the pivots with a liberal amount of oil. (There is nothing better than oil to loosen old oil.) Take hold of the center wheel and move the train forward and backward a few times. This will loosen the dry and gummed oil on the pivots and in the holes. Then rinse or brush movement in benzine.
You can now ascertain whether or not any of the holes need closing, which should be done before actual cleaning.
The object in using the flat faced punch is that it draws the metal from the sides of the countersink of the plates toward the center and leaves the metal thicker at the hole than would the ball faced punch, which has a tendency to drive the metal away from the hole and leaves the metal thinnest at the hole, the very point where it is needed.
The hole in the punch clears the hole in the plate.
By the use of the flat faced punch I experienced less difficulty in closing the holes evenly and keeping the train wheels upright, whereas, in my opinion, the ball faced punch, unless very carefully used, and even then sometimes will close the hole unevenly.