Replacing Wool Pile

A quick learner says:
I am changing the white pile weather stripping on my windows and am having a hard time installing the new piece on the sides since there is no way to start it. Do you make a tool for that?
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Bob from SWISCO responded:

Take a look at this video below that shows the 'cut-out' method for replacing wool pile weatherstripping. See if this helps. 

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