Dave Sr. from SWISCO responded:
September 27, 2017
Thanks for choosing SWISCO.com. Could it be you need a bubble with a wider T-leg like the 58-171 or does the bubble just slide out at the end of the sash? If it is sliding out at the end of the sash, I would suggest using a type of adhesive caulk. Use just enough to keep the bubble in the track. You don't want to use too much in case you need to replace the weatherstrip in the future.
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