How did you remove the HEV to clean and regrease the o-ring(s)? I've had my v6 apart to put an new eta 2824 (elabore) in so have seen the inside of the bare case. The valve is spring loaded and moves outward when pushed with a pegwood tip. Is there a special wrench required to dismantle and reinstall the HEV? I've never messed with a HEV before, but would like to clean it up like you did and put some watch gasket silicone on it for an added measure of protection. Thanks in advance for anything you'd be willing to share.