This is the liquid types from various threads & members here
The sleeve and hairs below are to hold and wick liquid to the elements.
The looser hairs allow better airflow .
Repacking with just hairs vs or with the 671-212 "Pac-man" felt with whichever heater is an apples vs oranges thing imo.. but liquid and looser hairs likely holds more liquid Id think. (new unit ) top upsidedown, but mind the technique, hair ends get packed in the well)
If you get a cover 671-160, I'd try for a metal one. Ive never had one melt.
If you needed glue or sealer or "brush on electric tape", high/extreme heat automotive silicone can take that heat all day. ( near primer red, but they may have new colors now too...?)