Look at the last photo on this post. http://www.rcuniverse.com/forum/fb.asp?m=6289820

Also this one. http://www.rcuniverse.com/forum/fb.asp?m=6730611

It goes on that little hole in the plate. Actually, I don't solder them. I tap the hole out for an 8-32 and screw a muffler pressure nipple into the plate. Then I turn it over and grind the excess off of the inside of the plate so it can't harm the diaphram. Gives it a very tidy look.