Not sure about those felt clunks...I bought into the recommendations and installed one on my DLE30 too.
After a season of heavy use, I started getting lean-out problems.
Checked the carb screen and it was filled with white fibres from the felt clunk.
Told the small engine dealer I bought the felt clunk from and he admitted it's happening.
So I installed a regular clunk and went back to an in-line extra-fine filter.
It seems to have solved the problems.
Maybe there are good and bad felt clunks...mine was sold as a Walbro brand name...
Just saying...