how do I prevent the crank arm from popping out of the track on my casement windows?

Install new and longer screws. The old ones rusted, were to wimpy to start with or were installed improperly and therefore have always been stripped-out.
Reply to

Site Timeline Threads

HomeOwnersHub website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.