Unscrewing a stubborn screw

TheBeast45
TheBeast45 Posts: 39
edited June 2017 in MTB workshop & tech
Hi everyone, I am trying to burp my hydraulic disc brakes but can't get my reservoir open! I broke 1 flathead screw driver trying to get the screw out. I tried wd40 but it still isn't budging. I'm not using a philips head because it will most likely strip the screw. Any ideas?

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