Should there be a gasket on the HD-20 carb lid? If so, would it cover everything around the float bowl ring (hopefully that description makes sense)? I will cut one myself but wanted to check.
Yep HD 20s have a gasket. I seem to be able to tear them two out of three times opening the carb so I can vouch for them being easy to make.
Two tools I’ve found incredibly useful for gaskets are a circle cutter and a single hole paper punch. Both are easy to find in art supply or stationary shops and really speed up the process.