The 940 DMFs are fairly reliable in my experience. I've abused mine and no significant issues. It not like VW ones that don't last well atall.
A clutch (and/or DMF) change mainly need the driveshaft disconnected and gearbox out, which isn't a big task with a proper lift. I did it myself with axle stands and trolley jack.
Still a soft pedal confuses me. The pedal force will be linked to the cover plate springs, hyraulics and friction in the system. You tend to find the friction builds up especially the ball pin plastic cover wears away. There is no really difference hear with a DMF. The spings Dia mentions is just the slack take up dampers, not the clamping springs.
Is there any lift in the pedal? can you lift it higher with your foot? Everything is plastic and you can loose clutch travel as it wears slots in the pedal and drive boss in the mater cyl.
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