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I would not use any type of metal material in the tube. Any pieces that come loose go right inside your engine and will probably go places you don't want it to.

A bit of mist around the cap is not terribly unusual. Perhaps it will lessen when the rings get seated well.

If your oil level it right up to the full mark it may mist a bit more than if the oil level is kept halfway between the full and low mark on the dip stick. Quite a few keep their oil level at the halfway mark.