On 29/08/2020 16:34, newshound wrote:

I think I would immerse it in diesel for a week. Are the grub screws
out? If so, relatively light tapping should then move the rods with much
less force than it would take to break the casting.


Two minutes before posting this I was watching a repeat of the "Repair
Shop". As others have suggested an overnight soak in Auto (Gearbox)
Transmission Fluid/Oil and an Acetone mix to remove rust and free up a
mechanism.

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