Hello Jay. I am sorry to say that I am not going to use those buttons in PDP-11's, but in my StarShip (click the starfield on http://home.hetnet.nl/~tshaj). I have developed the code for the main screen, with a correct view on the stars. The code allows for magnification and view opening angles. To use these "options" I am looking for 'nice' buttons, like the ones that HP uses. Those buttons have a LED in the middle to indicate that the button is active. If those buttons you have found at the surplus dealer have the LED in the middle of the button, I would like to buy several of them. Let's say 20 with the green colored LED and 20 with the red LED. I can pay via PayPal, or send cash $$ in a letter, what you prefer. Hoping you have found the correct buttons ... and willing to do the effort, kind regards, - Henk. (PS. would it help to say that I was one of the donators?)