I'm learning another piece from the Peter Dickinson book I bought for Grade 7 - his 3 Satie Transformations. The second Transformation is to be played with the una corda pedal held down throughout. Is there any way of using something else to hold this pedal down so I don't need to use my left foot? Partly because it's quite tiring practicing with one foot holding a pedal down the entire time, but also because there is one bit where I would like to switch rapidly from the sostenuto pedal to the sustain pedal, and it would be a huge amount easier if I could use my left foot for the sostenuto with my right on the sustain.
I did try holding the una corda pedal down with a 5 kilo dumb bell, but even that wasn't heavy enough!
Anyone found any successful methods?