Hi Simon, if chemicals don't work you could try heat, My C1940's 'Home
Mechanic' book says 'very hard putty can be softened by holding a red-hot
iron against it' (then talks about heating up pokers!) probably the best
modern way would be with an electric soldering iron.
Otherwise maybe a tool like a Dremel with a suitable bit such as a diamond
or grinding wheel. Fein also make a great tool which oscillates rather than
spins which might work well.
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