Paul from SWISCO responded:
July 17, 2017
Looks like you have welded vinyl window sashes. To remove the wool pile and foam bulb weatherstripping, you will need to get a utility knife and make a very small slice on the track where the weatherstripping slides, specifically at one of the corners. That will let you slide out the old seal. Just be very careful, as you only want enough to slide them out. You do not want to damage the sash or have the new weatherstrip fall out once it's installed.
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Paul from SWISCO responded:
August 2, 2017
Wool pile, in some cases, will have a fabric backing instead of plastic, but you should still be able to slide this through the groove. Our 58-127 wool pile does have a plastic backing.
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