New to biking componentry and attempting to upgrade a bike on my own. The bike I have currently has really crappy chinese components; so when trying to remove the BB I couldn't seem to figure out how to remove the drive side part part of BB (pic). I've tugged on in the flat ends with a crescent wrench with all my strength and it won't come loose, it's difficult enough with it only being 2.5mm in width! It doesn't look welded and I can see the threads, but I can't even figure out how to google a solution..