Once it's out I bring it to an area I have covered with newspaper to catch all the creepy old sponge bar mess as you scrap it out. I use a large flat head screw driver. I've done 3 now and they scrape out pretty easily.
If there is any residue left of the sticky strips from the old sponge bar I squeeze in some Goo Gone to soak.
It doesn't have to soak long. I start scraping up the old glue pretty quickly.
Here's the finished cleaned Sponge bar minus the old sponge. After Goo Gone give Sponge Bar a good cleaning as the Goo Gone is oily and you don't want it to stop the new foam from adhering. I use some regular household cleaner. As you can see I'm doing this outside in case the Goo Gone and household cleaner cause any noxious fumes. One can never be too careful mixing chemicals.
I buy Frost King Rubber Foam Weather seal 3/8" X 5/16" at Home Depot. All three of my knitting machines have used the same size. You might measure yours just in case.
Starting at one end remove the waxy strip to reveal the sticky strip and start centering it down the middle of the sponge bar. I like to hold my thumb and forefinger on each side of the sponge bar to assure it is going into the channel and sticking straight. Take your time it goes fairly quickly and you want it on right the first time.
After weather seal is applied glue a strip of ribbon on the exposed side of the weather seal with plain white glue. I used yellow ribbon as it was what I had in my stash.
It is now finished and waiting for glue to dry on the ribbon.
At the very end of the sponge bar on each side. Take a small piece of tape and wrap it around the ends. I usually forget this until I go to push in the sponge bar on the knitting machine and foam starts to peal back. The tape wrapped around the ends keeps it on the sponge bar as you slide it in. Now I just have to clean up my mess.
Any questions feel free to contact me.