Disclosed in this specification is a method for making a pleated filter cartridge by placing a pleated filter on a mold and adding a polymerizable potting compound to the inner cavity of the pleated filter. The deformable wire is received in the slot, and the deformable wire is deformable between a first configuration where the deformable wire is received in the slot, and a second configuration where the deformable wire is released from the slot and reshaped to support the body on an object. This design by itself can provide a high mass resolution capability and a very precise start pulse for an ion mass spectrometer. Each threshold may be adjusted as a function of the number of members or of other criteria.