I know it is a risky way of clearing a blockage but with E-S on beri beri vindaloo and Tmac forcefeeding Lampy with linseed oil then just one small spark should do an awful lot of shifting.
If the feculation itself doesn't shift then whatever it was blocking certainly will.
(Is there a non return valve or blow out preventer on the BB/voice pipe?)
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David V
Lord Finchley tried to mend the electric light
Himself. It struck him dead and serve him right
It is the duty of the wealthy man
To give employment to the artisan
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