1 don’t use lamp oil use paraffin
2 dunk them till they stop bubbling and drain till it is just dripping a bit. (Long soaking is not needed it is an old spinners myth)
3 do a search for related topics this one has been covered many many times before you will find many an augment on the merits of pre-soaking and quick dunks if you look for them
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before i met those lot i thought they'd be a bunch of dreadlocked hippies that smoked, set things on fire ,and drank a lot of tea but then when i met them....oh wait (PyroWill)