Pressure button from Beiter.
Cushion plunger Decut ZX229
Very nice button with precise click adjustment at a great price. Complete with spare tip, spanner & three spring weights.Screw 5 /16
Fivics Cushion plunger 540
Pressure button in a compact design for easy setting and adjustment.
Adjustable Length: 19.5mm (min), 26.5mm (max)