Dave Sr. from SWISCO responded:
October 9, 2012
Thank you for posting! The sun always plays havoc on plastic parts, and 16 years is a long time. It's no surprise that yours are becoming brittle. The plastic used for window parts these days might be a little better, but you may want to consider some of our metal pulls. Please take a look at our 70-004 Pull Ring with Screen Groove and our 70-018 Aluminum Lift Handle.
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