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Tried the consensus protocol for fixation from scratch. Consists of removing the outer case and immersing the bundles and jelly in Cysteine+MgCl2. Concentrations tried in a 35mm dish at 18 °C (no stirring):

2mL 10% cysteine + 2mL MgCl2: Dropped the bundles and observed what happened to the jelly and how easy it was to remove it. It seems that the cysteine does liquify the jelly slightly, but after 15 min it was still there a somehow sticky.

Since this gave no results I did not try lower concentrations and tried to use 10% cysteine directly (without MgCl2) which strangely did not give much results.