Yes, it’s soldered in. You could actually buy one of those spacers and solder a spring to it. If you remove the solid post on the driver you could then have the spring facing towards the driver. If a spring is used you need to make sure you use one that allows high enough current or you can’t use turbo (100%). I’m using some that take up to 18A which I bought off a BLF user from Canada. Convoy sells these and take 8A no problem, so you’d perhaps need to install a bypass, not sure what the driver needs.