A little mark will due ya.

Fish Mouthing
A neat lttle trick to figuring where to put the fish mouth is to butt the tube you want to fish mouth against the one it is to attatch to and use a fine point Sharpie Permanent marking pen held against the tube to be butted up to and trace its shape on the other tube.
It does not have to be perfect. It is just a guide to aid in the fish mouthing process with a grinder. And remember to do both sides.

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