Paul from SWISCO responded:
May 12, 2016
Thanks for contacting us! This happens from time to time. Some windows have closed channels, preventing the wool pile from being replaced easily. I can only assume they were designed hoping you'd replace the window, not the seal. Fortunately, we have a work around. What we like to do is slide in one half of the base into the track and then work the other half in with a putty knife. With a little persistence you should be able to work in the whole length. Hopefully this helps!
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