Casement window not working as smooth as it used to? You may want to inspect your hinge set. If you need to replace them, this video can help!
2-Bar Hinge Set, 10″ SS
Product Code: 36-013-10
https://www.swisco.com/2-Bar-Hinge-Set-10-inch/pd/Replacement-Window-Operator-Accessories/36-013-10