Long right angled screwdriver

Hello,
I want to tighten a screw at the back of a radiator. Instead of removing the radiator, I thought it would be better to use a ratchet screwdriver or a right angle screwdriver. However the screw is at 20 cm depth. I would appreciate any advice from you on the best tool to use to tighten the screw instead of removing the radiator as i can't find as long right angled screwdriver / ratchet screwdriver. Thank you.

Thank you.

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