I wouldn't recommend propping the clutch pedal on a car with a hydraulic clutch.
The pressure plate would be held away from the clutch disk only until the
slave cylinder leaked down or blew out. Then you'd be left with a probably
inoperable clutch AND the clutch assembly rusted shut.
On a car with a mechanical clutch, though, this is probably a good idea.
The slight "de-springing" effect you would experience from loading the
pressure plate and the pedal return spring would be overcome by the effort you
save by not needing to disassemble the clutch.
The best answer, of course, is to drive the car. An alternative would be
to start it once a week and idle it up to temperature, and then "feather"
the clutch until you know the rust is gone.
Surprisingly, I never experienced a stuck clutch on any of my Spitfires,
even though one parts car sat for years and I'd occasionally put the driver
up for months at a time. Must be this Texas climate. This was a top-down
morning
with temps in the high 60s and partly cloudy.
Take THAT, snowbirds!
Jim
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