ok... I think I know what the shoulder washers are. Looking at a cross-section they would look like a 'T'. I thought you wanted the coil to get sooty or gunky? (As you say... I'll learn ) I tried tape over the air hole with a smaller hole punched into that... It didn't seem to work too well. Again... I'll learn.
Glad to hear you're headed in the right direction... And thanks!
Glad to hear you're headed in the right direction... And thanks!