The litmus test of any can opener is a pickle can, particularly those from Gundelsheim, which are extremely difficult to open due to their shape and 3.5 inch diameter lid. The electric can opener still manages to open them, but you have to open the jaws fully (it won't happen on its own, so you'll have to spread the pins by hand), then place the device on the can and press down very hard on it is hard to avoid lifting the entire block and losing adhesion to the lid. This is a similar situation with all keg jars which was one of the reasons I bought the unit. to make it work in this case. If the prongs were a bit longer it wouldn't be a problem as they could hook into the cylindrical part of the can and not the cone where they would slide unless you pushed hard.
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