I ordered replacement tips and sponges and springs from Rubenstein guys. I also order replacment heating elements for my gun and a new gun.
installed the new gun and WOW ! I'm desoldering again. Love my setup again. I will rebuild my original gun and other replacement with the new heating elements that got broken due to my stupidity when I dropped the gun and cracked the ceramic heating element. The other one got broken when I let somebody else use the gun and he was BANGING the tip of the gun on the board To clear the solder blockage. Use the long tool to push the stuck solder into the spring trap guys.
I keep several spring elements handy in case performance starts to suffer and clearing the gun doesn't help. I hot swap a new spring in the collection device and set the old one aside to cool. When I get 2-3 of these units set aside, I dump the loose solder catchings into the trash, then I fire up my Weller soldering gun (heavy duty job) and slide the spring trap onto the tip of the gun over the trash. The solder blobs that are stuck in the spring just melt into the trash and clear the spring again. Takes about 60 seconds to do all three of them. Then I am ready for another round of desoldering. Different tip sizes are important. My replacement gun came with a big tip and while it might be okay for sedoldering flybacks, it is too big for caps and ICs. I'll be changing it out when I get back home.