Thanks, good to know about the Polyurethane rod. I will consider that in the future.
I used 80% wintergreen oil and 20% ethyl alcohol .
I tested one cushion rubber at first, checked every hour for 4 hours. Once I confirmed the rubber is safe and would not disintegrate into pieces . I submerged all the cushion rubbers overnight. I kept it at room temperature.
Day 2 I verified whether all the cushion rubbers were soft and continued to soak the hard ones for longer . The wintergreen oil does leave behind minty or balm smell on the rubber but it works.
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