Replacing Woolpile in french doors

A home owner from Guilford, Surrey says:
I have Woolpile weatherproofing in my french doors, and as per your video I can see that they slide. However the end of the channels are closed so that the woolpile cannot slide out. The casing looks plastic rather than metal - if it was metal I would be more tempted to gently bend the casing to allow the woolpile to slide out.

Any ideas?

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Bob from SWISCO responded:

See if the video below helps. This details the 'cutout' method for removing wool pile. It may be your only option. 

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