Scale Hardware is the U.S.'s best source for scale model fasteners.

[Cedge]

You can see them in action on the water engine thread. They are securing the flange onto the copper Air Column. The nuts are offered in 3 widths... 5/32 (grossly over sized), 1/8 and what is called "Scale". The "Scale" are quite tiny and look right for our use. Those are the ones shown in the photo.

Steve

 

[Mcgyver]

those look good, I hadn't seen that thread - nice looking engine, I like the attention to detail like flanges to connect piping and the oilers etc. good stuff