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Yes. It's a perko door closer fitted in my residential front door. It's a metal clad wood frame.Basically the bolt and chain comes off from the spring unit. So there is no tension already. It's the 2nd time it got off from it. It's really a pain to screw it back. So I decided to replace it...

My door closer was broken that I need to take it off from the frame and replace it. However, I can't find any screwdriver can fit it. I've tried Allen Keys but it looks like the hole is round. Anybody have any idea on how to take it off without breaking the door frame? Is there any special tools...