There was a sign at my favorite hardware store as a kid, lt said "We've got it, if we can find it. I bought mixture screws last winter to complete my carb rebuild ('83) and I'm pretty sure there was one or more left, of course they don't have my speedy adjustment modification. But...I'll try to ascertain their exact location tomorrow, they are in a labeled box (not that that will help me any!) I'll get back to you soon. Hopefully I won't need the other half of the hardware store sign. "If we can't find it, you didn't really need it!".