Truth casement window operator arm

Hello, thank you for posting,

Please start by reviewing the dimensions of the 39-188 and 39-187 operators to see how they compare to the original. 

If a new hinge is needed as well, see the 36-048 2-bar hinge set will a 10" sill track. Please note that both the top and bottom hinges would need to be replaced at the same time. Let us know what you think and if you have any additional questions! 

No problem!