As much as I initially liked the Cherry Bomber, Mine has been plagued with firing issues since about day three(Ivogo clone from Angelcigs). Initially it was great, never misfired and performed admirably even with some very low resistance builds until about the third day of heavy use when a dark grey almost black spot started to form on the inside of the aluminum where the brass button met the aluminum case. Since that spot has initially formed NOTHING I have done has been able to remedy it in any sort of permanent fashion, without fail once a day I have to remove the entire 510 to get at the button to remove the dark spot or it refuses to fire unless I push the button VERY hard.
This has happened with the MCV Panzer magnets in the switch AND with a spring in the switch, I've been desperate for a remedy but I fear that the metallurgic differences of the button and
mod may be working against me here, over time with use raw untreated aluminum becomes exposed after firing it for half a day, even when I'm using a high quality lubricant(Nyogel 760G) this happens, then as it sits overnight I believe the humidity in the air is causing the freshly exposed raw aluminum to corrode and form a very non-conductive spot in the same exact place every time.
I'm not a huge fan of untreated aluminum being the main contact point in a mod, at least for me and my usage in the weather I live in...it's not been the best experience. My Ivogo Osmium box has been getting used tons because of the CB not working properly, the osmium uses a brass to brass contact at the switch movement points and has yet to develop any firing issues at all with the same builds I was using on the CB.