A method for reducing a servicing noise is provided. Method for manufacturing such device. The first and second portions are movable relative to one another from a first configuration for insertion that minimizes trauma to skin and tissue to an enlarged configuration after insertion to further retract skin and tissue in a minimally invasive manner. The real time process recipe adjustment and determination if additional etching is requires allow tightening of the process control. In this adsorbing element, the first and second side edges of each adsorbing sheet are located respectively at the pair of facing trough portions so that each adsorbing sheet is supported between the pair of the facing trough portions.