The seal isn't particularly strong so I'd imagine that fluid would burst it when you pull the lever, never tried though.
Ta for the advice, think I'll pop the seal and go for it. Wil update with the outcome.
In the OEM factories they don't break the seal before installing the lever, that's why on your first brake bleed you'll often see little white bits floating in the fluid.
@user67706akajimmythegrin started
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The seal isn't particularly strong so I'd imagine that fluid would burst it when you pull the lever, never tried though.