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also does anyone have any experience of fitting hydraulic hinges to help with opening/closing a heavy hatch?
Search for gas struts. Maybe 250N ('strength rating' if you like, how many NM of force they exert) on the sides of the hatch/lid, according to the overall weight. Depending on the surround of the opening, they can push the surround away/damage it as well as opening the hatch/lid, so make sure the surround is securely fastened down. They can be used with normal hinges
how much should expect to pay for a new external door (plus storm doors), supplied and fitted (outside london)? in my mind I've got a figure of about £1200 but not sure if that's way off?
also does anyone have any experience of fitting hydraulic hinges to help with opening/closing a heavy hatch?