I've always had trouble with blast chilling my little Weller (the one with the MP131 tip) that I use for soldering parts. The brass wool cleans the tip very quickly without cooling it down, making my tips last longer and completing my projects faster. It was just five individually wrapped balls of brass wool - not a small holder - but I ended up using a 2" nozzle. Adapter on a threaded pipe as a holder and it was functional! Maybe someday I'll print a custom holder, but if it doesn't break.