The rubber seal on the one I received has come loose at the top so I urge you to replace it. I compared it to the OEM version I pulled from my DC16 and found the following differences: 1) The rubber gasket is slightly thicker than the OEM, so closing the block requires more force and is a tighter fit. I expect this will decrease over time as the rubber compresses. 2) The rubber pad/strip is attached to the plastic frame with some sort of surface tape and wrapped around the frame which I couldโฆ