Folks,
I am continuing to realize improvements with the fit and sound of my BL-03. I mentioned before that I ordered a bunch of silicone keyboard switch o-ring bumpers to try out as spacers on the nozzle to keep the tips from sliding down and to get a deeper tip insertion. Well, my o-rings came in and the result is very positive. You can see from the photos that I have rings that color-code the earphones for right and left for easy identification. The rings I am using here are 9 mm total diameter, 4 mm hole diameter, and 2.5 mm ring thickness. This is the perfect size for the BL-03 and KZ "flip tips", allowing the tip bore to fully cover the ridge on the nozzle and hug the shaft of the nozzle for a secure fit, without allowing it to slide any lower. This size ring will likely work perfectly for most other tips too. I have a whole bunch of them and would be happy to send them to folks at cost, but I don't think I am allowed to "sell" things through the forum without paying for that access or something, right?
EDIT: by the way, I have these o-rings in red, blue, and black.
EDIT #2: apparently, there is no cost to be able to sell on the forum! Yay! I posted a for sale listing for the rings here:
https://www.head-fi.org/threads/fs-...-03-and-others-for-better-fit-eartips.922261/
Anyway, the difference between BL-03 stock and BL-03 with replacement balanced cable, replacement tips, and spacers is absolutely like night and day. I still plan to try a few more tips and also try stuffing these tips with some earplug foam for better isolation, but I am very close to the ideal configuration (for me) at this point already.