For anyone else who was curious what the fix was, but not curious enough to read the whole long-form piece:
> Shilling worked out the precise volume and pressure of fuel being pumped into the chamber by the Merlin engine and designed a brass restrictor with a hole precisely the diameter needed to allow maximum flow of fuel, and therefore maximum power, without flooding the engine. Crucially, Shilling’s solution could be fitted without the removal of the carburettor, so the fix could be made in situ at operational airfields. Though it didn’t eliminate engine cut-outs altogether, it did minimize it to an acceptable degree.
> Shilling worked out the precise volume and pressure of fuel being pumped into the chamber by the Merlin engine and designed a brass restrictor with a hole precisely the diameter needed to allow maximum flow of fuel, and therefore maximum power, without flooding the engine. Crucially, Shilling’s solution could be fitted without the removal of the carburettor, so the fix could be made in situ at operational airfields. Though it didn’t eliminate engine cut-outs altogether, it did minimize it to an acceptable degree.