Works best on flat surfaces,
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This review is from: Halogen Bulb Removal Tool Green (DIY & Tools)
We have some energy efficient GU10 fluorescent bulbs in downlighters in our kitchen. One of which started playing up recently and required removal. As these are recessed in the ceiling its difficult to get a purchase on them to twist for release, and then pull down to extract. Saw this device on Amazon and decided to give it a go. First attempts proved that this struggles on the new type of GU10 bulbs which have a slightly curved surface, unlike old halogen GU10's which are flat glass. Tested it on some flat surfaces and found it to have great suction and grip. I decided to perservere and eventually got it to work on the bulb and eventually remove it. Also works well when trying to refit the bulbs as gives extra grip when rotating them back into electrical contacts in the socket.
In summary this works better on bulbs with flat surfaces, but with a bit of trial and error can work on those with slightly curved surfaces.