I could be wrong, but I've come across seals where that 'insert' is the outer of the seal, and don't seem to fit, but on closer inspection of the casing the 'insert' for the old seal is still in place.
Its been a good few years since I last replaced the crankseal so I could be wrong.
Hang on I've just re-read this - Now I think the 'insert' is part of the old seal and is redundant and the new seal just fits in without it
Cheers


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