Aluminum window weather stripping: how to?

A quick learner from North Carolina says:
I just ordered your 58-002 wool pile

How do I remove and replace the weather stripping in my aluminum windows?
I watched your video on replacing the weather stripping by simply sliding out the old wool pile.
However, my mounting channels are welded into mitred corners. What is my removal option?
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Dave Sr. from SWISCO responded:
Check to see if there is a notch at one of the ends of the sash to help you slide in the wool pile. If not, you can sometimes use the back of the blade in a utility knife to force it into the channel.
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