Here's a more engaging rewrite:

My parents lost the little pins for their tumble windows—classic!

Instead of hunting for replacements, I had a much more fun idea: 3D print them.

They don’t need to be bulletproof, just reliable enough for daily use. So I knocked out a quick prototype in PLA to test the fit and function. Once that’s dialed in, the final versions will be printed in tough ABS for better durability and that satisfying “I fixed it myself” feeling.