Continue with reassembly.

Carefully set the top plate on, sliding it into the two tabs you did not bend upward. Turn switch up so you can check to be certain the contactor is still positioned correctly. (image one below)
Press top plate down and hold in place. (image two below)
Using water pump pliers, carefully bend back the two tabs you bent outward to release the top. (image three below)
Now connect the power supply for the dash lights. (image four below)
And now you're finished and your switch should work well for a long time.

Okay, what happened to cause your switch to fail? Generally the end of the sliding bakelite piece breaks off, these pieces fall down and prevent the slider from working at all. Take a look at image five below. This is where all the plastic bits and pieces you cleaned out earlier originated. Good luck.
Attachments
12 install top plate.JPG (35.41 KB, 895 downloads)
13 hold down.JPG (33.87 KB, 908 downloads)
14 bend tabs.JPG (40.04 KB, 899 downloads)
15 reattach.JPG (19.25 KB, 898 downloads)
the problem.JPG (18.47 KB, 893 downloads)


~ Jon
1952 1/2 ton with 1959 235 | T5 with 3.07 rear end