A removable insert for footwear has a slot placed in its medial edge which extends below the arch. A dielectric body is formed by an ALD film deposition process comprising a gas flow sequence where a purging step after supplying a source and a reactant gases is a two-stage purging of vacuum purging and gas purging and the step of supplying a reactant gas is further divided. The arrays of test tubes is attached to the flanges via living hinges that enable the flexing to occur. A gap is located between the stem and cap when the stem contiguously engages the seat such that fuel flow through the opening is prevented.