If it happens to be the right length, I've just poked them through with pokey things with no ill effects, but it's unlikely to be the right length.
Actually it's the correct length, so small drill bit and good to go? Shimano make out like you just connect and pull the lever and all is well.
The seal isn't particularly strong so I'd imagine that fluid would burst it when you pull the lever, never tried though.
@user67706akajimmythegrin started
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If it happens to be the right length, I've just poked them through with pokey things with no ill effects, but it's unlikely to be the right length.