SuperCut owners did you loose the retainer Screw that secures the blades onto your old style model?
This blade retainer replaces your lost screw or serves as a convenient back-up.
This blade and accessory Screw is exactly the same as the one that came with your 1st generation old Supercut unit.
This blade screw is used together with the 2-Peg T-Spanner for tightening the blades and only works with Fein Supercut models:
FSN400E
FSN404E
Astlxe 636