I posted a link earlier to where to buy -
https://www.aliexpress.com/w/wholesale-damper-knowles.html
You can get the tool & the filter through that link. Might be other places to buy but ali definitely has them.
Yes, you use the threaded end to remove & replace the filter. Don't need any glue at all. It just slides in & out. The insertion depth is right at the top of the nozzle, which makes it very easy to remove & replace.
I know people may be nervous about doing this mod, especially with what I experienced with the vent filter, but I assure its easy & safe if you just do the BA filter only. Totally worth trying because it changes the sound very noticeably. For me the change is for the better. If you don't like the change, you can easily put the white filter back in and return it to the stock sound.
Also, nobody has really elaborated on the stock cable vs custom cable, but I can confirm that going with a high quality pure silver cable made a noticeable difference over the stock cable as well. The stock cable is not very good at all. And between pure copper vs pure silver, the pure silver gave me a preferred sound signature.
My current setup -
EJ07 w/ grey filters in BA tube + 8-core pure silver cable + large azla sedna earfit (non-light) + meizu pro dongle/9038S (depends on my mood/listening situation). After owning for roughly 1 month this is the best & most enjoyable combo. Crazy detail/clarity/pscho-acoustics. Tight bass (but not bass-head level), amazing timbre tonality in the mids, slight sparkle in the highs but a tad hot in some tracks due to the grey filters vs white. Vocals less forward & shouty vs stock, stage is wider than stock.